Biology: Life on Earth (11th Edition)
11th Edition
ISBN: 9780134256283
Author: Audesirk
Publisher: PEARSON
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Chapter 18, Problem 1AC
Extinctions have occurred throughout the history of life on Earth. Why should we care if humans are causing a mass extinction event now?
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Do you believe were in a mass extinction period right now? Why or why not?
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Chapter 18 Solutions
Biology: Life on Earth (11th Edition)
Ch. 18 - 1. Almost all of the oxygen gas in today’s...Ch. 18 - Extinction a. generally does not occur except...Ch. 18 - 3. In the endosymbiotic origin of the...Ch. 18 - 4. Which of the following does not list...Ch. 18 - Prob. 5MCCh. 18 - 1. Because there was no oxygen in the earliest...Ch. 18 - 2. The molecule ________ became a candidate for...Ch. 18 - 3. Complex cells that contain a nucleus and other...Ch. 18 - 4. The sperm of early land plants had to reach the...Ch. 18 - 5. Early plants that protected their seeds within...
Ch. 18 - Prob. 6FTBCh. 18 - Amphibians gave rise to ____________, which had...Ch. 18 - 1. What is the evidence that life might have...Ch. 18 - Prob. 2RQCh. 18 - 3. Explain the endosymbiont hypothesis for the...Ch. 18 - 4. Name two advantages of multicellularity for...Ch. 18 - What advantages and disadvantages would...Ch. 18 - 6. Outline the major adaptations that emerged...Ch. 18 - Outline the evolution of humans from early...Ch. 18 - Extinctions have occurred throughout the history...Ch. 18 - In biological terms, what do you think was the...
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- The geological record indicates that over the course of the last 510 million years, the Earth has seen at least _____ mass extinction events.arrow_forwardWhich of the mass extinctions was the largest? What percentage of life went extinct during that time?arrow_forwardThe fossil record shows that in just the last 600 million years, there have been five instances of sharp decreases in the diversity and abundance of living organisms. what are these events? a. droughts b. mass extinctions c. reversals of the earth's magnetic field d. great migrationarrow_forward
- Geologic changes often accompany mass extinction of life forms. Why do you think this is true?arrow_forwardWhich eon has more events occurring in it? During which eon did life evolve? What is the difference between background extinctions and mass extinctions?arrow_forwardWhy is studying extinctions is critical for our survival?arrow_forward
- WHAT IS MASS EXTINCTION? HOW DID MASS EXTINCTION EVENTS INFLUENCE EARTH'S HISTORY?arrow_forwardWhat is the “sixth mass extinction event”?arrow_forwardWhich of the following is characteristic of the end of the Paleozoic Era? a There was a mass extinction that eliminated 70% of marine life. b All of Earth's landmasses are joined together in a supercontinent called Pangaea. c Mountains began to form. d The supercontinent Pangaea separated into present-day continents.arrow_forward
- Is extinction normal? Explain. What is NOT normal about it now? Why is the loss of biodiversity so crucial to Earth and us?arrow_forwardThe term Anthropocene implies that we were the major force of nature prior to 10,000 years ago. our global impact has accelerated greatly during the past couple of centuries. humans have impacted the earth at a planetary scale so severe that we can consider this a new geological epoch. millions of years from now the record of human life will be eradicated. there are more humans than bacteria.arrow_forwardWhat is adaptive Radiation It is when radiation cause mutations It is when animals adapted to solar radiation It is when a species rapidly adapts to many new and open environmentsarrow_forward
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