which extant animals descended directly from dinosaurs?

Western paleontologists soon made a pilgrimage to Beijing to see the fossil. C) embryogenesis. Since 1500 alone, approximately 900 species have gone extinct. Birds are the only extant animals that descended directly from dinosaurs. Which of the following is not a reproductive strategy found among primates? A popular item is a mosaic in which a few dozen small slabs form a map of China; fossil fish appear to swim toward the capital, Beijing (and no map is complete without a fish representing Taiwan). and a skull. And of course they aid flightbut not always, as ostriches and penguins, which have feathers but do not fly, demonstrate. All are omnivores. Moreover, the posited link seemed contrary to what everyone thought they knew: that birds are small, intelligent, speedy, warmblooded sprites, whereas dinosaursfrom the Greek for "fearfully great lizard"were coldblooded, dull, plodding, reptile-like creatures. "It was such an amazing fossil," recalls paleontologist Hans-Dieter Sues of the National Museum of Natural History. No! So the next time you and a friend go to a farm, keep in mind that every one of those squawking chickens is actually the closest living relative of one of the most magnificent predators the world has ever witnessed! A) lizards B) crocodiles C) snakes D) birds E) tuataras theo Hero Member Posts: 698 Mammals originally arose at least 178 million years ago and scurried among the dinosaurs until the dinosaurs, with the exception of birds, were killed off 66 million years ago, when the bulk of those monsters were wiped out. This hollow ball shaped stage is called a, The fungus body, such as a mushroom, is called a ____________, This type of fungus is killing our beloved frogs _________________, Deuterostomes have this type of cleavage_____________, Fungi have cell walls made of _______________, Chelicerata have _________ pairs of antennae, The sessile stage of a jellyfish is called ______________, Molting, as when a caterpillar sheds its exoskeleton, is known as____________, A cocoon that larvae form before complete metamorphosis is better "Deep in evolutionary history, it is extremely difficult to draw the line between birds and dinosaurs," says Xu. 2003-2023 Chegg Inc. All rights reserved. Huxley, a renowned anatomist perhaps best remembered for his ardent defense of Charles Darwin's theory of evolution, saw little difference between the bone structure of Compsognathus, a dinosaur no bigger than a turkey, and Archaeopteryx, which was discovered in Germany and described in 1861. Most dinosaurs and pterosaurs become extinct at the close of the _____ era. If you ask most people to name a fish, theyll come up with something like a tuna or a salmon. Which of the following organisms are most closely related to humans? lancelets 4 (b) Thymine. b. GH stimulates the transport of amino acids into cells. Most of the stock in the fossil shops comes from farmers who hack away at fossil beds when they aren't tending their fields. D) All of the choices listed. This is likely because Australia was cut off from the rest of the world for so long, allowing marsupials to evolve undisturbed by other mammal groups. In the past 15 years, thousands of exquisitely preserved fossil birds have emerged from the ancient lakebed, called the Yixian Formation. birds, and mammals, The ___________is the membrane that stores waste in embryonic birds Now that argument was blown away: Anchiornis is millions of years older than Archaeopteryx. Nucleotides a) consist of the phosphate group, 5-carbon sugar, and an organic nitrogenous base b) are the building blocks of DNA and RNA c) are synthesized throughout the life of an organism d) All the above (a, b, c) are correct. In fact, birds are considered to be a type of dinosaur, specifically a group of theropods known as maniraptoran dinosaurs. Cookie Settings, Roger Peterson / National Geographic Stock, Kim Amos / Science Photo Library / Photo Researchers, See 11 Breathtaking Bird Images From the Audubon Photography Awards, The Real History Behind the Archimedes Dial in 'Indiana Jones and the Dial of Destiny', Forensic Artist Reconstructs the Face of a Teenager Who Lived 1,300 Years Ago, Eight Menacing Saber-Toothed Creatures That Stalked the Earth Long Ago, How One Man Accidentally Killed the Oldest Tree Ever. D. protozoa and algae E. All of these choices are correct. Since the last of the non-avian dinosaurs died out 65 million years ago during the mass extinction that closed the curtain on the Cretaceous period, birds have evolved other characteristics that set them apart from dinosaurs. Experts are tested by Chegg as specialists in their subject area. C) Listeriosis. Litter Size. Xu suggests that feather evolution may have gotten started in a common ancestor of pterodactyls and dinosaursnearly 240 million years ago, or some 95 million years before Archaeopteryx. That is cool. Aside from minor differences in the shape of neck vertebrae and the relative length of the arms, early birds and their Maniraptoran kin, such as Velociraptor, look very much alike. B) crocodiles. A. T lymphocytes B. They likely evolved from a group of four-legged tetrapods called labyrinthodonts. But as they diversified and adapted to different environments, they took on various shapes and sizes from snakes to crocodiles! a. An experienced fossil hunter, Li split the slab and beheld a creature unlike any he had seen. You can specify conditions of storing and accessing cookies in your browser. Of the animals listed below, which urinates upon standing from a recumbent position? In most terrestrial amphibians, such as frogs and toads, each pouch produces two internal gill slits that open up into chambers (gill cavities) lined with thin sheets of epithelium supported by cartilage rods called gill arches. One of the most beguiling specimens to emerge from Liaoning's shale beds is Microraptor, which Xu discovered in 2003. B. the mineralization of the endoskeleton C. Feet with digit A. (a) Cytosine. Crocodiles are members of the Reptilia taxonomic class with other creepy crawlers, including snakes and . This contrasts ectothermic animals like amphibians and fish, who rely on external heat sources to regulate their body temperature. Author Question: Which of the following are the only extant animals that descended directly from (Read 647 times) federox Sr. The skin and central nervous system develop from, In deuterostomes the blastopore develops into the. It allows deposition of eggs in a terrestrial environment. The first sign of gill development in a developing embryo is the appearance of pharyngeal pouches. Additionally, reptiles generally live on land, while dinosaurs are mostly terrestrial but include some aquatic and flying species. Each pouch gives rise to a single external gill filament in fishes and some aquatic amphibians, such as newts and salamanders. A. d. It provides insulation to conserve heat. If you encounter an animal with feathers, you may be certain that it is a bird. B) Overgrowth of the yeast Candida albicans causes necrosis of intestinal mu. An increase in this hormone is primarily responsible for the maturation of the follicle. a. fungi b. parasites c. virus d. bacteria e. TLR. There are around 10,000 species of amphibians, about 9,000 species of reptiles, and about 5,500 species of birds. E) tuataras. a)RNA b)GTP c)ATP d)cAMP, Which of the following is an example of endogenous pyrogen(s)? 28. But after the dinosaurs went extinct 65 million years ago, mammals began to thrive and diversify. Which of the following are the only extant animals that descended directly from dinosaurs? Reptiles evolved from reptile-like ancestors during the Carboniferous Period (360-299 million years ago). Soon scientists were gathering other intriguing physical evidence, finding that fused clavicles were common in dinosaurs after all. inside the mother are called. d. It changes rapidly from generation to generation. Introduction of a foreign species. Another theory suggests that increased brain size was the first trait to appear in hominins. Which of these is not involved in protein digestion? Birds are comprised of any of the 9,600 living species that are unique in having feathers. Ichthyosaurus Facts. There are two different types of marsupials- those that live in Australia and those that live in South America. Translation, Which of the following options is correct? a. the shelled, amniotic egg c. two pairs of appendages d. bony scales b. the ability to maintain a constant. The resulting structures are called. Transcription B. Small mammals (including primates the size of shrews) were, on the other hand, living at the period of the dinosaurs. a. the shelled, amniotic egg c. two pairs of appendages d. bony scales b. the ability to maintain a constant body temperature e. a four-chambered heart 27. And modern birds, unlike their Maniraptoran ancestors, have a big toe that juts away from the other toes, which allows birds to perch. This was the first indication that birds descended from reptiles. (a) Bacteria (b) Viruses (c) Fungi (d) HIV but not other viruses. Somehow, mammals managed to live, thrive, and establish themselves as the dominant species on the planet. It lived around 125 million years ago, based on the dating of radioactive elements in the sediments that encased the fossil. They also have sharp teeth that can tear through flesh easily. In a cold environment that supports life, an ectotherm is more likely to survive an extended period of food deprivation than would an equal size endotherm because the ectotherm a. expends more energy per kilogram of body mass than does the endotherm. which extant chordates are postulated to be most like the earliest chordates in appearance? d. climate change. (TOP 5 Tips). "Chairman, come here and look," Zhou says to Zhang (who earned his playful nickname as chairman of IVPP's employees union). Additionally, many species of birds have feathers, which are believed to have evolved from the scales of their dinosaur ancestors. Birds are the only animals with feathers, giving them many advantages over other animals. These are outpouchings of tissue from the embryonic throat that invade adjacent areas of the mesoderm (the middle layer of cells). b. nucleic acids. But to fossil collectors, Chaoyang is a paradise, only a one-hour drive from some of the Yixian Formation's most productive beds. C) they lose their acrosome. One of China's star paleontologists, Zhou Zhonghe, smiles. Because of the feathers, Ji Qiang, then the director of the National Geological Museum, which bought one of Li's slabs, assumed it was a new species of primitive bird. The region has also yielded stunning dinosaur specimens, the likes of which had never been seen before. E) None of these are substrates for trypsin. (a) contain DNA (b) are part protein and part RNA (c) store amino acids (d) hydrolyze phospholipids (e) All of the above. "It passes the sniff test," Carrano says. C) Procarboxypeptidase. Such a vibrant pattern suggests that "feathers first arose as agents for color display," Benton says. On a visit to Beijing that October, Philip Currie, a paleontologist now at the University of Alberta, saw the specimen and realized it would turn paleontology on its head. Sinosauropteryx was even more stunning. C) DNA determines the amino acid sequence of our proteins. Birds, which are classified as members of the class Aves, are comprised of more than 10,400 extant species. This is due to their successful adaptation to both terrestrial and aquatic environments. engineering. Richard Stone has written about a Stonehenge burial, a rare antelope and mysterious Tibetan towers for Smithsonian. Many theories exist about which traits appeared first and how this divergence occurred. It supports the31. Host cells of viruses include: A. human and other animals. This is another key characteristic that helps distinguish these groups from others; birds are bipeds or two-legged creatures. c. It is shaped in a double helix. While many other animals have evolved from dinosaur ancestors, these three lineages have remained relatively unchanged for millions of years. Extant birds may be distinguished from other extant vertebrates by their feathers (answer: B). c. progesterone. See what palaeontologists study. "I was digging holes for planting trees," recalls Li, who now has a full-time job at a dinosaur museum built at that very site. a. lizards e. tuataras C. snakes d. birds b. crocodiles 26. All these feather types have been found in fossil impressions of theropods, the dinosaur suborder that includes Tyrannosaurus rex as well as birds and other Maniraptorans. By the mid-Triassic, there were many synapsid species that looked like mammals.The lineage leading to today's mammals split up in the Jurassic; synapsids from this period include Dryolestes, more closely related to . c. They have DNA and RNA, microtubules, c, Which of the following is not a process carried out by bacterial flora? Learn the definition of a paleontologist and find the difference between archaeology and paleontology. When mRNA molecules are formed, they are complementary to DNA with the exception that a. an A in DNA matches a T in mRNA. A. Lymphatic B. Mammals are distinguished by their hair or fur, which provides: Most mammals give birth to live young instead of laying eggs; however, there are a few exceptions, such as platypuses, echidnas (monotremes), and pangolins (pholidotes). b. That is, it had a backbone made of vertebrae. As hominins diverged from other primates, which of the following Which of the following options is correct? These include birds, crocodiles, and snakes. d. a fish in the ocean moving toward shallower waters to warm up. When Are Dinosaurs Coming Back All four groups are amniotes, meaning they lay their eggs on dry land instead of in the water. The fossils finally have confirmed, to all but a few skeptics, that birds descended from dinosaurs and are the living representatives of a dinosaur lineage called the Maniraptorans. Extant animals are those animals that are still in existence, and birds are the only extant animals to have evolved directly from dinosaurs. Deinonychus, or "terrible claw" after the sickle-shaped talon on each hind foot, stood about 11 feet from head to tail and was a lithe predator. Other paleontologists speculate feathers first evolved to retain heat. This is strong evidence that Archaeopteryx was indeed an ancestral bird. In short, we are still determining exactly what the common ancestor of chondrichthyans and osteichthyans looked like. One of these things is not an archosaur. (a) T helper cells (b) Cytotoxic T cells (c) B clone cells (d) B memory cells. C) It carries amino acids to the ribosome. Hollow filaments may have dissipated heat, much as the frills of some modern lizards do today. Yet, these mighty birds of prey are yet one of many animals that came back from extinction in the 20th century. B) contention that birds are much older than we originally thought. A few animals are the only ones that descended directly from dinosaurs, including crocodiles, birds, and Komodo dragons. B) Pill facilitates the transfer of DNA among bacterial cells. C) Migrating motility complex. Microraptor, from the Dromaeosaur family, was not an ancestor of birds, but it was also unlike any previously discovered feathered dinosaur. The enzyme pepsin digests a. carbohydrates. Reptiles evolved from amphibians and are distinguished by their dry scales, which provide protection from predators and help them regulate their body temperature. Finally, most reptiles and mammals are endothermic, meaning they maintain their body temperature internally. Vivid evidence for that theory appeared when scientists unveiled the true colors of 125-million-year-old feathers. These mammals had also evolved to a wide variety of foods, which were far more diversified than had previously been thought. Menstruation is triggered by a drop in the levels of a. LH. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Numerous blood vessels course through these filaments, providing an extensive surface area over which gas exchange occurs between water and blood passing through them. A seam splits a russet-colored fish in half, producing mirror impressions of delicate fins and bones as thin as human hairs. f. They move extremely fast. O Glycerol is a subunit of steroids O The subunits of polysaccharides are monosaccharides O Amino acids are the subunits of nucleic acids O Nucleotides are large molecul, Choose the correct answer: Rh factor is a human blood component derived from A) monkeys B) chimpanzees C) gorillas D) orangutans. Which of the following are the only extant animals that descended directly from dinosaurs? Dinosaurs are members of this wider group of reptiles. Our experts can answer your tough homework and study questions. Four of the following are nitrogenous bases of DNA or RNA, while is an amino acid. Which of the following is true about gametes? Which of the following does not take place during fertilization? Zhang found that the filaments running down its back and tail must have made the dinosaur look like an orange-and-white-striped barber pole. four-chambered hearts? Moreover, its bone structure was similar to that of Archaeopteryx. dry environments? Or filaments may have evolved independently at different times. Their feathers separate them from all other types of animals; no other creatures on the planet have feathers like theirs. These hominids lived in Europe along with Homo sapiens. Which of the following is a concept of cell theory? What is the single unique characteristic that distinguishes extant Yet, we also know that birds and crocodiles are the only extant species that share a common ancestor with dinosaurs. e. relaxin. D) Responses are general, Which of the following nitrogenous bases is only found in RNA but NOT in DNA? e. They functionally mature in 64 days. While lizards, crocodiles, snakes, and tuataras are all reptiles and share a common ancestor with dinosaurs, they did not evolve directly from dinosaurs. Its a beak without any teeth. His office at IVPP, across the street from the Beijing Zoo, is cluttered with fossils and casts. "You gradually go from the long arms and huge hands of non-avian Maniraptorans to something that looks like the chicken wing you get at KFC,"says Sues. Because of its fused breastbone and asymmetrical feathers, says Xu, Microraptor surely could glide from tree to tree, and it may even have been better at flying under its own power than Archaeopteryx was. Marsupials are interesting animals because they have a pouch on their stomach where they carry their young. A cell in which the majority of the ribosomes are free (i.e., not bound to the endoplasmic reticulum) is most likely producing large amounts of, Converting a prairie to a farm field is an example of ________. (a) phagocytosis (b) interacting directly with pathogens (c) producing antigens (d) producing antibodies. A) It is present at birth. What nitrogenous bases are found in DNA? The first birds were small carnivorous predators with sharp teeth and claws. From a hole he unearthed a two-foot-long shale slab. (a) Conception (b) Fertilization (c) Development (d) Pregnancy. invests less energy in temperature regulation. When Huxley looked at ostriches and other modern birds, he saw smallish dinosaurs. Which of the following can be transmitted to humans who eat infected meat? B. Crocodiles C. Tuataras A. "Sensational." B) they undergo activation. However, perhaps most notably, wildlife . Who is it? a. DNA carries out protein synthesis and RNA directs protein synthesis. Stefen Chow. These animals have remained relatively unchanged since the time of the dinosaurs and have been able to adapt and survive in todays world. Birds are any of the 9,600 existing species that are unique in having feathers, which is the main attribute that differentiates them from all other creatures. A) lizards B) crocodiles C) birds D) tuataras A) Mucin B) Enzymes C) Hormones D) Waste products E) DNA, Which of the following requires RNA polymerase? There are four main groups of land vertebrates: amphibians, reptiles, birds, and mammals. Feathers in their most primitive form were single filaments, resembling quills, that jutted from reptilian skin. The next month, Currie, a longtime China hand, showed a photograph of it to colleagues at the annual meeting of the Society of Vertebrate Paleontology. Gills are outgrowths of the pharyngeal (throat) region that develop into respiratory organs specialized for exchanging oxygen and carbon dioxide with water. But there was one important feature that had not been found in dinosaurs, and few experts would feel entirely comfortable asserting that chickadees and triceratops were kin until they had evidence for this missing anatomical link: feathers. D), Which of the following organisms form biofilms? Estimates of their population during the early 18th differ but range between 300,000-500,000. The find eliminated the final objection to the evolutionary link between birds and dinosaurs. These animals may represent. What is a genetic mutation simple definition?. E) Two of the options listed are correct.

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