Biology: Life on Earth with Physiology (11th Edition)
11th Edition
ISBN: 9780133923001
Author: Gerald Audesirk, Teresa Audesirk, Bruce E. Byers
Publisher: PEARSON
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Textbook Question
Chapter 31.3, Problem 2CYL
explain why biologists fear that a mass extinction is occurring as a result of human activities?
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When will we consider the recent crash in species richness to be part of a 6th mass extinction event?
Group of answer choices:
A. When at least 75% of the existing species go extinct within a 2-million year period
B. When the current rate of extinction is at least 1000 times higher than the natural background extinction rates
C. When at least 90% of the existing species go extinct within a 1-million year period
D. When the current rate of extinction is at least one million times higher than the natural background extinction rates
If extinction is a natural part of life on Earth, why should we care about protectingendangered species
Explain
Which of the following statements about extinction is not correct? (a) extinction is the permanent loss of a species (b) extinction is a natural biological process (c) once a species is extinct, it never reappears (d) human activities have little impact on extinctions (e) thousands of plant and animal species are currently threatened with extinction
Chapter 31 Solutions
Biology: Life on Earth with Physiology (11th Edition)
Ch. 31.1 - describe the goals of conversation biology?Ch. 31.1 - Prob. 2CYLCh. 31.2 - Prob. 1CSCCh. 31.2 - describe the major categories of ecosystem...Ch. 31.2 - Prob. 1TCCh. 31.2 - Prob. 2CYLCh. 31.3 - define mass extinction?Ch. 31.3 - Prob. 1HYEWCh. 31.3 - explain why biologists fear that a mass extinction...Ch. 31.4 - Prob. 1CSC
Ch. 31.4 - Prob. 1CYLCh. 31.4 - Prob. 1TCCh. 31.4 - Prob. 2CYLCh. 31.5 - Prob. 1CSCCh. 31.5 - Prob. 1CYLCh. 31.5 - Prob. 1TCCh. 31.5 - Prob. 2CYLCh. 31.6 - Before 1700, wolves roamed over almost all of...Ch. 31.6 - describe the principles of sustainable...Ch. 31.6 - In 1970, Atlantic leatherback sea turtle...Ch. 31.6 - explain how population, technology, and lifestyle...Ch. 31 - List some reasons that the ecological footprints...Ch. 31 - Prob. 1FIBCh. 31 - A factor that increases humanity ecological...Ch. 31 - Prob. 1RQCh. 31 - Search for and describe some examples of habitat...Ch. 31 - Prob. 2FIBCh. 31 - Prob. 2MCCh. 31 - What is ecological economics? Why is it important?Ch. 31 - Prob. 3FIBCh. 31 - Prob. 3MCCh. 31 - Prob. 3RQCh. 31 - Prob. 4FIBCh. 31 - Prob. 4MCCh. 31 - Prob. 4RQCh. 31 - The smallest population of a species that is...Ch. 31 - Which of the following is not true of a population...Ch. 31 - Why are efforts to protect monarch butterflies a...Ch. 31 - A Native American saying tells us that We do not...
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- An extinction vortex describes a) changes in a population’s gene pool that lead to a loss in fitness across time. b) a species ability to adapt to changes in their environment. c) the continuous series of extinctions caused by competition between species. d) a population that has a reduction in fitness because it cannot escape a Hardy-Weinberg Equilibrium.arrow_forwardWhat pattern has been observed between humans moving to a new area and extinction?arrow_forwardWhich of these contributed to humans beginning to abandon a hunter-gatherer lifestyle approximately 15,000 to 10,000 years ago? a)climate change b)extinction of large pray c)domesticating animals d)growing crops, resulting in increased food supply e)all of the abovearrow_forward
- Answer these questions A) State other factors that cause extinction B) Why organisms found on islands are more vulnerable to extinction than other organisms? C) How extinction can be prevented?arrow_forwardAdaptive radiations can be a direct consequence of three of the following four factors. Select the factor that is NOT a direct consequence of adaptive radiation. Select one: a. Genetic drift b. Vacant ecological niches (niches are environment "space" where a particular organism has resources required to survive and reproduce) c. New evolutionary innovations d. Colonization of a new region that contains suitable habitat and few competitor speciesarrow_forwardWhich of the following contributed to mass extinctions?a. climate changeb. continental driftc. meteor impactsd. All of these are correct.arrow_forward
- The 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_forwardWhat is Macroevolution? A) The change of a population over several generations B) The history of a species from its origin C) The history of all populations and their descendantsarrow_forwardWhich is NOT an example of a population bottleneck: A) The Cretaceous-Paleogene extinction event B) Human activies that produce antibiotic resistant straings (i.e. choosing not to take the full does of prescribed antibiotics) C) The Amish in the United States who, due to inbreeding, are at higher risk for genetic diseases D) All of the above are examples of a population bottleneckarrow_forward
- 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?arrow_forwardCould you please help find a reasonable answer that fit the hypothesis?arrow_forwardCan you explain which answer is accurate and why it's the correct choice?arrow_forward
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