Loose-leaf Version for What Is Life? A Guide to Biology 4E & LaunchPad for What is Life? A Guide to Biology 4E (Twelve Month Access)
4th Edition
ISBN: 9781319154639
Author: Jay Phelan
Publisher: W.H. Freeman & Co
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Question
Chapter 12, Problem 8SA
Summary Introduction
To review:
The difference between background extinctions and mass extinctions.
Introduction:
Extinction refers to the dying out of a whole species; the species no longer exists.
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What is the “sixth mass extinction event”?
what is mass extinction?
If a sixth extinction event is occurring, how is it similar or different from the previous five mass extinctions? What sort of evidence do you think scientists look for to determine whether we are living through a mass extinction?
Chapter 12 Solutions
Loose-leaf Version for What Is Life? A Guide to Biology 4E & LaunchPad for What is Life? A Guide to Biology 4E (Twelve Month Access)
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- What patterns can be compare to the mass Extinctions events?arrow_forwardHOW MANY YEARS AGO DID THE MOST RECENT EPOCH BEGIN? HOW MANY MASS EXTINCTION EVENTS HAS EARTH WITNESSED SO FAR?arrow_forwardWhat is a mass extinction? What makes the 6th mass extinction that is happening right now different from the last 5?arrow_forward
- What are the five mass extinctions of the past and the current theory of the sixth mass extinction? For each extinctions, what caused the extinction and how was ecosystem stability impacted? Was there any speciation that occurred afterward?arrow_forwardDistinguish between background extinction and mass extinctions.arrow_forwardIncreases in species diversity arise because of A)increases in the rate of speciation. B)decreases in the rate of extinction. C)higher rates of speciation than extinction. D)All of the above The rates of extinction since the origin of life have followed which pattern? A)Gradual decrease B)Gradual increase C)No change D)Several episodes of mass extinctions, with much lower rates of fluctuating extinctions in between Which of the following statements about the outcome of the evolution of a new species through hybridization is false? A)The new species is always an intermediate of the two parent species. B)The new species may have traits that allow it to inhabit environments different from both parental species. C)The new species may have greater genetic diversity and therefore greater trait diversity than the parental species. D)All of the above How can ecological processes influence the evolution of a population? A)Ecological…arrow_forward
- (A) What is extinction? How extinction is different from expiration? Explain. (B)List the five mass extinction episodes occurred in the history of Earth. Characterize the nature and extent of each extinction episode.arrow_forward1) What piece of evidence initially convinced Dr. Alvarez that a mass extinction had occurred at the K-T boundary? 2) What was the first clue that an asteroid had struck Earth at around the same time as the mass extinction? 3) What additional observations and findings supported the asteroid-impact hypothesis? Which piece of evidence definitely showed that an asteroid had struck Earth? Explain your answer.arrow_forwardAccording to Figure 2 above, how many extinction events contributed to the end-Ordovician mass extinction and when did they occur?arrow_forward
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