CAMPBELL BIOLOGY IN FOCUS-MOD.MASTERING
3rd Edition
ISBN: 9780135191811
Author: Urry
Publisher: PEARSON
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Chapter 19.3, Problem 3CC
WHAT IF? Fossils show that dinosaurs originated between 200 and 250 million years ago. Would you expect the geographic distribution of early dinosaur fossils to be broad (on many continents) or narrow (on one or a few continents only)? Explain.
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WHAT IF? Suppose a molecular clock dates the divergence of two taxa at 80 million years ago, but new fossilevidence shows that the taxa diverged at least 120 millionyears ago. Explain how this could happen.
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Chapter 19 Solutions
CAMPBELL BIOLOGY IN FOCUS-MOD.MASTERING
Ch. 19.1 - How did Huttons and Lyells ideas influence Darwins...Ch. 19.1 - MAKE CONNECTIONS Scientific hypotheses must be...Ch. 19.2 - How does the concept of descent with modification...Ch. 19.2 - Prob. 2CCCh. 19.2 - MAKE CONNECTIONS Review the relationship between...Ch. 19.3 - Explain how the following statement is inaccurate:...Ch. 19.3 - How does evolution account for (a) the similar...Ch. 19.3 - WHAT IF? Fossils show that dinosaurs originated...Ch. 19 - Which of the following is not an observation or...Ch. 19 - Which of the following observations helped Darwin...
Ch. 19 - Prob. 3TYUCh. 19 - The upper forelimbs of humans and bats have fairly...Ch. 19 - DNA sequences In many human genes are very similar...Ch. 19 - SCIENTIFIC INQUIRY DRAW IT Mosquitoes resistant to...Ch. 19 - FOCUS ON EVOLUTION Explain why anatomical and...Ch. 19 - FOCUS ON INTERACTIONS Write a short essay (about...Ch. 19 - SYNTHESIZE YOUR KNOWLEDGE This honeypot ant (genus...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- \. Read some papers (find them using any of several literature-search engines that your instructor can suggest) that make different estimates of the timing of either the origin of bilaterian animal phyla or the orders of mammals. How different are the estimates based on molecular clock evidence versus paleontological evidence? What might account for these differences, and how might they be resolved?arrow_forwardWHAT IF? If the most recent common ancestor of Tulerpeton and living tetrapods originated 370 millionyears ago, what range of dates would include the origin of amphibians?arrow_forwardWHAT IF? If you discovered a fossil of an extinct mammal that lived high in the Andes, would you predict thatit would more closely resemble present-day mammalsfrom South American jungles or present-day mammalsthat live high in Asian mountains? Explain.arrow_forward
- Ⓒ Macmillan Learning There are many examples of species that were ancestral to or closely related to the ancestors of modern humans, Homo sapiens sapiens. The figure shows when several key human ancestors were alive. Label the figure with the names of the human ancestral species. Millions of years ago 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 Australopithecus africanus Ardipithecus ramidus Australopithecus boisei Australopithecus afarensis Homo erectus Answer Bank Homo habilis Homo sapiens sapiens Australopithecus robustus Homo neanderthalensisarrow_forward1. Concept Check The similarity in bone structure and arrangement between cats and bats suggests that Humerus Radius Ulna Carpals Metacarpals Phalanges Human Cat Whale Bat a) bats originated from bird-like ancestors. b) bats originated from four-legged ancestors, such as cats. c) modern bats fly much faster than ancient bat species. © 2018 Pearson Education, Inc. 2. Concept Check Darwin proposed the theory of natural selection as the mechanism of evolution based on three observations about nature. Which of the following were part of Darwin's observations? a) Populations have the potential to produce more individuals than the environment can support. b) Individuals in some populations have varied characteristics. Variation in individuals appears to be inherited. d) all of the above © 2018 Pearson Education, Inc.arrow_forwardEvolution in Humans: 1) describe several techniques that paleontologists today use to establish fossil age 2) describe how tracking changes in DNA sequence among related organisms can be used to create a migration maparrow_forward
- . WHAT IF? Imagine that we could replay the history oflife. Is it possible that a group of vertebrates that colonized land could have arisen from aquatic gnathostomesother than the lobe-fins? Explain.arrow_forwardUsing Index Fossils Problem How can fossils be used to determine the relative ages of rock layers? Introduction It is easy to compare the ages of fossils found in sedimentary rocks at one location. Fossils found in an upper rock layer will be younger than fossils found in a lower layer, unless the layers have been overturned. It is not as easy to compare the ages of fossils found in rocks at different locations. Scientists use index fossils to determine the relative ages of rock layers. Scientists use radiometric dating to find the actual age of rocks and fossils. In this lab, you will work with drawings of rock layers from different locations. Each layer will contain at least two fossils. Using the fossils as clues, you will organize the layers from oldest to youngest. Skills Focus Interpret Visuals, Sequence, Draw Conclusions Materials scissors Safety Do not direct the points of the scissors toward yourself or others. Use the scissors only as instructed. Pre-Lab…arrow_forwardA 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?arrow_forward
- Scientists know that the last common ancestor between chimpanzees and humans lived 5-7 million years ago because: O It lived shortly after the disappearance of the dinosaurs at 10 million years ago. O The carliest hominins were found in woodlands The time the last common ancestor existed can be calculated by comparing chimpanzee and human DNA and using a "molecular clock" O Chimpanze fossils first appear in the fossil record 10 million years agoarrow_forwardWhat is a vestigial structure? * A feature inherited from ancestors that has lots its original function A feature that we have in common with other species A feature that shows what our descendants will look like A type of bone found in snakes & %23 %24 6. 3. 4 y b narrow_forwardn. Scientists have found one new fossil that is similar to Archaeopteryx. It is only the second fossil of its kind. It shows an animal that had a long-feathered tail and small teeth, like non-avian dinosaurs. But the animal also had flight feathers and wings, like modern birds. The fossil also shows a fused clavicle bone, which confirms the relationship between birds and dinosaurs because they are the only two groups with this characteristic. What is true about this scenario? It shows evidence of evolution. It shows evidence of widespread expression. It shows evidence of climate change. It shows evidence of causation.arrow_forward
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