BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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Chapter 34, Problem 2S
Some people state that the dinosaurs have not “gone extinct,” they are with us today. What evidence can be used to support this statement?
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A number of scientists believe that the Permian extinction was caused by huge volcanic lava flows (from the Siberian traps) that may have caused low oxygen concentrations compared to the high oxygen levels in the Permian. Does this low oxygen level after the Permian extinction make it likely that dinosaurs, especially large ones, did not evolve immediately after the Permian extinction (252 million years ago)? Why or why not?
Because of selective forces, the dinosaurs were superbly adapted to their environments. After the dinosaurs became extinct, the small mammals that had been relatively unimportant animals in the background flourished and evolved into many new types, including the line that led to human beings. It is unlikely that these new types would have ever evolved had not the dinosaurs disappeared. If the extinction of the dinosaurs was caused by an extraterrestrial impact, did it matter how well they were adapted to their environment? What does this suggest about the starting cause in the evolutionary success of these new types of mammals?
What caused the extinction of the dinosaurs?
Chapter 34 Solutions
BIOLOGY
Ch. 34.1 - List the specific characteristics of echinoderms.Ch. 34.1 - Explain what is meant by pentaradial symmetry.Ch. 34.1 - Describe the five extant classes of echinoderms.Ch. 34.2 - List the defining characteristics of chordates.Ch. 34.2 - Prob. 2LOCh. 34.3 - Describe the nonvertebrate chordates and their...Ch. 34.4 - Prob. 1LOCh. 34.4 - Prob. 2LOCh. 34.5 - Prob. 1LOCh. 34.5 - Prob. 2LO
Ch. 34.6 - Prob. 1LOCh. 34.6 - Prob. 2LOCh. 34.7 - Prob. 1LOCh. 34.7 - Prob. 2LOCh. 34.7 - Prob. 3LOCh. 34.8 - Prob. 1LOCh. 34.8 - Prob. 2LOCh. 34.9 - Prob. 1LOCh. 34.9 - Prob. 2LOCh. 34.10 - Describe the characteristics and major groups of...Ch. 34.10 - Prob. 2LOCh. 34.10 - Prob. 3LOCh. 34 - Prob. 1IQCh. 34 - Prob. 2IQCh. 34 - Which of the following structures is not a...Ch. 34 - Which of the following statements regarding all...Ch. 34 - In the figure, item A is the ______ and item B is...Ch. 34 - Prob. 4UCh. 34 - The ____ of the bony fish evolved to counter the...Ch. 34 - Why was the evolution of the pulmonary veins...Ch. 34 - Which of the following groups lacks a...Ch. 34 - All of the following are characteristics of...Ch. 34 - Which of the following evolutionary adaptations...Ch. 34 - The reason that birds and crocodilians both build...Ch. 34 - Prob. 2ACh. 34 - The fact that monotremes lay eggs a. indicates...Ch. 34 - Prob. 1SCh. 34 - Some people state that the dinosaurs have not gone...Ch. 34 - In what respect is the evolutionary...
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- A scientist digs in an undisturbed field and finds a leg bone of dinosaur A about 6 meters below the surface. She keeps digging and finds a jawbone of dinosaur B about 15 meters below the surface. Based on this information, which is the most likely conclusion? Dinosaur A lived before dinosaur B. Dinosaur B lived before dinosaur A. Both dinosaurs are from the same geologic period.arrow_forward(1) What is the most common way for a dead organism to avoid decomposition? (2) Why do researchers look for fossils in places that are now dry and barren instead of other places like forests or grasslands? (3) What kind of dating from the lecture or textbook would be the best method for finding the number of years ago when a volcanic rock was formed? (4) Why is the pelvis of a biped shorter and wider than the pelvis of a quadruped? (5) Does the overall shape of Lucy’s pelvis resemble the human pelvis or the chimpanzee pelvis more? Do not think of the size, but compare the outlines of each bone. This is Lucy's skelton below.arrow_forwardHow do you think researchers and paleontologist determine where fossils of hominins are buried? answer must be at least 300 words in paragraph formatarrow_forward
- HOW MANY YEARS AGO DID THE DINOSAURS BECOME EXTINCT?arrow_forwardBirds are supposed to be the dinosaurs' closest relatives. List and explain five reasons why the Aves have been able to adapt (morphological traits) and survive in the ever-changing world we live into this day.arrow_forwardDiscuss: How old are the oldest camel fossils shown? How has the skull changed over time? How have the teeth changed over time? How have the leg bones changed over time? Table 15.1 Fossils are used by scientists to understand how camels evolved. Table 15.1 Camel Evolution Age Paleocene 65 million years ago Eocene 54 million years ago Organism Skull and teeth Limb bones Oligocene 33 million years ago Miocene 23 million years ago Presentarrow_forward
- What kind of fossils were formed out of dinosaur remains and activities? Why do you say so? (Give three)arrow_forwardDid dinosaurs and humans ever exist at the same time?arrow_forwardFossils show that dinosaurs originated between 200 and 250 million years ago. Would you expect the geographic distribution of early dinosaur fossils to be on multiple continents or on a single continent? Explain. Hint: refer to continental drift in your explanation.arrow_forward
- What is plausible evidence supporting the hypothesis that birds evolved from dinosaurs? Please choose the best option. a) Dinosaurs and birds are both predatory.b) Fossilized transitional forms are discovered that possess features of birds and dinosaurs yet are difficult to classify into either group.c) The wing structure of a bird is similar to a dinosaur.d) Bird fossils can be found alongside dinosaur fossils.arrow_forwardNeanderthals are recognizably human but have distinctive facial features and a stocky build that were evolutionary adaptations to cold, dry environments. They shared Europe for 10,000 years with Homo sapiens. Today they no longer exist. Beyond these facts the fate of Neanderthals has generated much debate. Why did Neanderthals become extinct? State at least four major factors to explain their fate.arrow_forwardPaleontologists at Grand Staircase-Escalante National Monument discovered a new ceratopsid skull. The skull has a moderate-sized neck frill, indicating a small body, and has two short horns. The table shows rock formations at the monument and the location of known fossils relative to those formations. Based on the evolutionary relationship suggested by the anatomy of the skull, in which of the following formations was the skull found? Dakota Wahweap Kaiparowits Canaan Peakarrow_forward
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