CAMPBELL BIOLOGY IN FOCUS-MOD.MASTERING
3rd Edition
ISBN: 9780135191811
Author: Urry
Publisher: PEARSON
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Textbook Question
Chapter 27.7, Problem 1CC
Describe how ocean communities changed in the early Cambrian period, and explain how animals may have influenced those changes.
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The Cambrian Explosion occurred approximately 542 million years ago. During the Cambrian, what ‘exploded’?
a. The diversity of species on Earth, including many major animal phyla that exist today
b. The Yucatan Peninsula, which was hit by an asteroid
c. The quantity of oxygen in the atmosphere due to the expansion of coniferous forests
d. Numerous volcanoes worldwide, leading to the fourth mass extinction
Explain what significant events happened during the Five major extinction events between the late Cambrian until the late cretaceous period.
Why would a rise in the availability of oxygen help explain why the Cambrian explosion occurred?
Chapter 27 Solutions
CAMPBELL BIOLOGY IN FOCUS-MOD.MASTERING
Ch. 27.1 - Prob. 1CCCh. 27.1 - Prob. 2CCCh. 27.1 - Prob. 3CCCh. 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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- What caused the Cambrian explosion? Describe current hypotheses.arrow_forwardDescribe three ways that an organism can leave a recordin sedimentary rocks and explain why this means that thereare gaps in the fossil record.arrow_forwardWhich mechanism of fossil formation created a replica of an organism's original form? a natural cast b amber-preserved c permineralization d trace fossilarrow_forward
- Which of the following periods is the earliest during which animals may have appeared? a. Ordovician period b. Cambrian period c. Ediacaran period d. Cryogenian periodarrow_forwardThe Cambrian Explosion occurred due to the widespread adoption of bilateral symmetry and the extinction of the Ediacaran fauna. What is this burst of diversity referred to? Explain what kind of triggers these two factors are and why they led to greater diversity.arrow_forwardGive typing answer with explanation and conclusion Question 2: Describe the Holocene epoch. How and why has it experienced dramatic changes in the past several decades?arrow_forward
- Explain why mammal jawbones may have shifted to being a single solid bone from multiple bones. Explain why the huge increase in diversity is usually attributed to the Cambrian Explosion even though diversity may have actually increased prior to the Cambrian.arrow_forwardWhat was the “Cambrian explosion” and how might you explain it?arrow_forwardWhat patterns in the fossil record would support that organisms have evolved?arrow_forward
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