Biology: Life on Earth (11th Edition)
11th Edition
ISBN: 9780134168296
Author: Gerald Audesirk, Teresa Audesirk, Bruce E. Byers
Publisher: PEARSON
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Textbook Question
Chapter 18, Problem 2MC
Extinction
a. generally does not occur except during unpredictable mass extinctions.
b. ordinarily occurs at a relatively slow but steady rate.
c. has eliminated species at a faster rate than they have been formed.
d. has not played a major role in the history of life.
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The graph below shows the population of three different families of marine organisms along five different mass extinction events. Each colour on the graph represents a family of organisms, and the Y axis shows how many species belong to that family.
a. What stage of population growth is displayed at point ‘0’ on the graph above?
b. The Extinction Event that occurred at point 3 was particularly significant. Using the graph, explain how this event impacted each marine family.
c. The extinction events mapped above had significant impact on marine life. What type of event could have a similar impact on the human population?
Ninety-nine percent of all the species that ever existed have gone extinct,
a. serving as evidence that current extinction rates are not higher than normal.
b. but most of these losses have occurred in the last 400 years.
c. which argues that the world just had too many species.
d. None of the choices is correct.
Which of the following statements is not true of an ecological niche?a. A niche includes the physical environment, such as climate and water availability.b. A niche includes predators and parasites.c. Niche overlap may help to drive evolution.d. Two species cannot have overlapping niches.
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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- Arguments in favor of the overkill hypothesis of megafauna extinctions are a. Basically everywhere humans colonized, big animals went extinct b. Climate change similar to the end of the Pleistocene happened many times before, and there was no megafauna extinction c. In nearly all the Clovis kill sites in North America, mammoth or other megafauna are present d. All of the abovearrow_forwarda. are we amidst an extinction right now ? why b. is it a mass or background extinction,arrow_forwardA. How old is the Earth? B. How long did the longest eon (so far) last? C. How many years ago did the most recent epoch begin? D. How many mass extinction events has the Earth witnessed so far?arrow_forward
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- The most severe mass extinction event, linked to the formation of Pangaea and massive volcanic eruptions, occurred at the end of the _______ period. Group of answer choices a Devonian b Triassic c Cretaceous d Ordovician e Permian People value biodiversity for all of the following reasons except a food, fiber, and medicine. b the acceptance that extinctions are part of a natural process. c opportunities to study and understand the world they live in. d aesthetic pleasure from interacting with other organisms. e functioning of ecosystems and the benefits they provide.arrow_forwardThe main arguments against the overkill hypothesis of megafauna extinction are a. Lots of species other than megafauna went extinct b. Rapid climate change destroyed the habitat that the megafauna depended on c. Many megafauna in North America went extinct before humans arrived d. All of the abovearrow_forwardDistinguish between biological extinction and mass extinction. Does every species have the right to survive without human interference, regardless of whether they serve a useful purpose to humans? Explain?arrow_forward
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