Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Chapter 31, Problem 3MC
Summary Introduction
Introduction: Extinction means the complete loss of the species or organism in the present day. It is a natural phenomenon; the background rate was about 1 to 5 spices per year. The current data show that the modern rate of extinction is more than the background. It is around 1000–10,000 times more than the background.
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Ecological dominants are
a. the most numerous or make up the most biomass within a community.
b. are species that may not be the most numerous within a community, but whose role is so significant that its absence would bring about considerable change.
c. species that are introduced into an area where they do not naturally occur.
d. the most important species on the planet.
A conservation biologist has been asked to explain why it is important to protect biodiversity. She would list all of the following reasons except for which one?
A. Humans are dependent on many species for food, medicines, fiber, and other necessities.
B. Biodiversity can be exploited indefinitely for the profit of humans.
C. Other species have inherent value and humans have a moral obligation to protect them.
D. Biodiverse ecosystems provide ecosystem services that sustain all life on Earth.
E. Biodiversity provides emotional and physical health benefits by providing places for humans to visit for wonder, insight, and exercise.
Which of these is a true statement?a. Habitat loss is the most frequent cause of extinctions today.b. Exotic species are often introduced into ecosystems by accidental transport.c. Climate change may cause many extinctions but also expands the ranges of other species.d. Overexploitation of fisheries could lead to a complete collapse of the fishing industry.e. All of these statements are true.
Chapter 31 Solutions
Biology
Ch. 31.1 - describe the goals of conversation biology?Ch. 31.1 - Prob. 2CYLCh. 31.2 - Prob. 1HYEWCh. 31.2 - Prob. 1CSCCh. 31.2 - Prob. 1CYLCh. 31.2 - Prob. 2CYLCh. 31.3 - Prob. 1TCCh. 31.3 - Prob. 2TCCh. 31.3 - Prob. 1CSCCh. 31.3 - Prob. 3TC
Ch. 31.3 - Prob. 4TCCh. 31.3 - define mass extinction?Ch. 31.3 - explain why biologists fear that a mass extinction...Ch. 31.3 - Prob. 3CYLCh. 31.4 - Prob. 1TCCh. 31.4 - Prob. 1CSCCh. 31.4 - Prob. 1CYLCh. 31.4 - Prob. 2CYLCh. 31.4 - Prob. 3CYLCh. 31.5 - Prob. 1TCCh. 31.5 - describe the principles of sustainable...Ch. 31.5 - Prob. 2CYLCh. 31.5 - Prob. 3CYLCh. 31 - Which of the following is not a major threat to...Ch. 31 - Prob. 2MCCh. 31 - Prob. 3MCCh. 31 - Prob. 4MCCh. 31 - Prob. 5MCCh. 31 - Prob. 1FIBCh. 31 - Prob. 2FIBCh. 31 - Prob. 3FIBCh. 31 - The smallest population of a species that is...Ch. 31 - A popular saying tells us that We do not inherit...Ch. 31 - Prob. 1RQCh. 31 - Prob. 2RQCh. 31 - Prob. 3RQCh. 31 - Why are efforts to protect monarch butterflies a...Ch. 31 - Prob. 1ACCh. 31 - Search for and describe some examples of habitat...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- A recent United Nations analysis report gathered data on declines in biodiversity across the world. Using the graphs provided, which statement shows an area of concern and is an alternative to the general hypothesis "Humans are responsible for a significant increase in the extinction rate among species in the world today as a result of damage caused to the environment"? A. Fertilizer use in developing countries should be encouraged to decrease the extinction rate B. Decreasing air pollution in the least developed countries would decrease species survival rate C. Protection of key biodiversity areas should be a priority for developed countries to lower the extinction rate D. Assisting developing countries with more sustainable methods of extraction of living biomass would increase species survival ratesarrow_forwardRabbits are important grazers, maintaining some important grassland habitats. If a catastrophe were to reduce rabbit populations what would happen? * a. There would be more grass for the surviving rabbits b. The grassland would be invaded by trees and shrubs c. All of the abovearrow_forwardWhich of the following is not true of a population of largepredators in a small reserve?a. The species may disappear from the reserve.b. The species will probably undergo a populationexplosion.c. The species will probably lose genetic diversity.d. The species may overeat its prey, causing a reduction inprey population.arrow_forward
- Why does the aquarium trade contribute to the introduction of nonnative species? a. Exotic species can escape or be released into local ecosystems. b. Aquarium owners do not always understand how ecosystems interact. c. Nonnative fish are shipped worldwide for aquariums. d. All of the above Please select the best answer from the choices provided A B C Darrow_forwardIn a tropical rainforest, an open gap lacking vegetation has been created by the fall of a large tree. Which of the following statements describes the characteristics of the plant species that are last to colonize this disturbed habitat? a. they have low reproductive rates and are good competitors b. they are good colonizers c. they have high reproductive rates and are poor competitors d. they are dominated by r-selected species e. they have high species diversityarrow_forwardWhen populations are drastically reduced in size, genetic diversity and heterozygosity a. are likely to increase, enhancing the probability of extinction. b. are likely to decrease, enhancing the probability of extinction. c. are usually not factors that influence the probability of extinction. d. automatically respond in a way that protects populations from future changes.arrow_forward
- Species that are the first colonists in a habitat undergoing primary succession a. are usually the fiercest competitors. b. help maintain their habitat constant so their persistence is ensured. c. may change their habitat in a way that favors the invasion of other species. d. must first be successful secondary succession specialists.arrow_forwardWhat is the importance of endemic hotspots to biodiversity conservation? A. Endemic hotspots contain many species found nowhere else, so the conservation of a small amount of area will protect many species. B. Endemic hotspots have the highest species diversity, so their conservation will protect the most species. C. Endemic hotspots are those that contain species vital to human existence, ssuch as medicinal species, and therefore humans rely on these areas the most. D. Endemic hotspots are where speciation rates are thegreatest, so the conservation of those areas will likely lead to the formation of many species in the future. E. Endemic hotspots have very low ecosystem stability, therefore require more protections to avoid extiction.arrow_forwardConservation hotspots are best described as a. areas with large numbers of endemic species, in many of which species are disappearing rapidly. b. areas where people are particularly active supporters of biological diversity. c. islands that are experiencing high rates of extinction. d. areas where native species are being replaced with introduced species.arrow_forward
- 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.arrow_forwardThe relative abundance of any one species within a community of many species is known as a. species evenness. b. species richness. c. specialization. d. population.arrow_forwardIf you are studying the changes in the panda population in Asia you are most likely considered a…. a. Population ecologist b. Ecosystem ecologist c. Global Ecologist d. Community ecologistarrow_forward
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