EBK CAMPBELL BIOLOGY IN FOCUS
2nd Edition
ISBN: 8220101459299
Author: Reece
Publisher: PEARSON
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Chapter 27, Problem 2TYU
Fossil steroid and molecular clock evidence suggests that animals originated
- A. between 710 and 770 million years ago.
- B. more than 100 million years before the oldest known fossils of large animals.
- C. during the Cambrian explosion.
- D. both A and B
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Chapter 27 Solutions
EBK CAMPBELL BIOLOGY IN FOCUS
Ch. 27.1 - Prob. 1CCCh. 27.1 - Prob. 2CCCh. 27.2 - What is the Cambrian explosion? Why is it...Ch. 27.2 - Prob. 2CCCh. 27.3 - Prob. 1CCCh. 27.3 - WHAT IF? Would it be accurate to describe the...Ch. 27.4 - Prob. 1CCCh. 27.4 - Describe two key adaptations of aquatic...Ch. 27.4 - MAKE CONNECTIONS The radiation of bilaterians in...Ch. 27.5 - Describe two adaptations that have enabled insects...
Ch. 27.5 - MAKE CONNECTIONS Compare and contrast how the...Ch. 27.6 - Describe three key amniote adaptations for life on...Ch. 27.6 - Prob. 2CCCh. 27.6 - WHAT IF? Which came first, the chicken or the egg?...Ch. 27.7 - Describe how ocean communities changed in the...Ch. 27.7 - Prob. 2CCCh. 27.7 - Prob. 3CCCh. 27 - Prob. 1TYUCh. 27 - Fossil steroid and molecular clock evidence...Ch. 27 - Which of the following was probably the least...Ch. 27 - Prob. 4TYUCh. 27 - Prob. 5TYUCh. 27 - Prob. 6TYUCh. 27 - Prob. 7TYUCh. 27 - FOCUS ON EVOLUTION In Figure 27.29, circle the...Ch. 27 - FOCUS ON ORGANIZATION Early tetrapods had a...Ch. 27 - SYNTHESIZE YOUR KNOWLEDGE Collectively, do these...
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- The phylogenetic tree of animals shows thata. rotifers are closely related to flatworms.b. both molluscs and annelids are protostomes.c. some animals have radial symmetry.d. sponges were the first to evolve from an ancestral protist.e. All of these are correctarrow_forwardWhich of the following statements is BEST supported by the phylogenetic tree? A The development of a bony skeleton was a significant evolutionary step for ocean-dwelling animals. B Most warm-blooded animals evolved to have hair, while cold-blooded animals did not. C Most land animals require a vertebral column, while ocean animals do not. D The evolution of the amniotic egg was specific to ocean-dwelling animals.arrow_forwardUntil recent discoveries suggested otherwise, animals existing before the Cambrian period were believed to be: a. small and ocean-dwelling b. small and nonmotile c. small and soft-bodied d. small and radially symmetrical or asymmetricalarrow_forward
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