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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Chapter 18, Problem 6MC
Summary Introduction
Introduction:
The habitat of the large land mammals is most important for their survival.
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Conservation 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.
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.
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.
Chapter 18 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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- Predators that are specialists usually have a population abundance: a. That is usually very small. b. That repeatedly oscillates up and down. c. That is very constant. d. That is mainly affected by climatic factors. e. That may locally go extinct (so depends on immigration).arrow_forwardWhen songbird species that nest in forest core areas are exposed to habitat fragmentation and more forest edge, they can become exposed to: A. increased predation of their eggs by raccoons B. increasingly dry micro-climate conditions C. brood or nest parasitism by brown-headed cowbirds D. All of the above are correct E. none of the above are correctarrow_forwardHippopotamus were introduced into a lake in central Africa. Grazing by Hippo resulted in an increase in the species diversity of grasses adjacent to the lake. The increase in grass diversity is likely due to… a. keystone predation of grasses by hippopotamus b. intraspecific competition among hippopotamus c. competitively dominate grasses d. competitive exclusion of grasses e. none of these choices are correctarrow_forward
- Part A) A biologist notices that the same species of Tortoise exists in Texas and Mexico.Yet these tortoises have somewhat different life histories. This is probably due to the diverse array of__that each tortoise has with different components its own environment.a. interactionsb. conversationsc. adaptationsd. all of thesePartB.). If water amounts and food production capabilities decrease, what can happen to carrying capacity?a. increase b. decreasePart C. Alabama should be a desert but it is a lush green environment. What keeps us from being so dry?a. Hadley Cellsb. Ocean Gyresc. Mountainsd. all of the abovearrow_forwardThe average niche breadth for space resources is wide for species of barnacles in an intertidal community. This pattern would indicate… a. niche overlap is low b. a greater level of competition between species c. coexistence via resource partitioning d. a greater number of species in the community e. high levels of disturbancearrow_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
- 16. Which is not a cause of extinction?. A. Animals eat too much B. Habitat loss C. Natural disasters D. over-hunting 17. How can you help prevent extinctions? A. By not polluting our environment. B. By protecting sensitive habitats and species. C. By not eating or buying products from endangered animals. D. By allowing other people to hunt for their food. 18. Which of the following was a natural factor that caused extinctions? A. Changes in the oxygen levels C. Over harvesting B. Habitat destruction D. Pollution 19. What do most scientists think caused the mass extinction of dinosaurs and other organisms at the end of the Cretaceous period? A. An object from space struck Earth. B. An ice age covered most of Earth with ice. C. The dinosaurs ate too many other organisms and then starved. D. Volcanic eruptions covered large areas with lava. 20. This.is the extinction of a species one by one, not a sudden loss of many species A. Background extinction B. Biotic potentíal C. Fragmentation…arrow_forwardA 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.arrow_forwarduppose frogs that hide in the grasses on the edge of a lake are less likely to be eaten by fish, and more likely to reproduce, than frogs that swim in the open lake. Hiding and swimming behavior are reliably passed to offspring. Hiding in the grasses exhibited by generations of frogs is an example of a(n): Group of answer choices A. genetic mutation. B. independent variable. C. acclimatization. D. adaptation. E. abiotic factor.arrow_forward
- Mowingexperiments in a Kansas prairie established that, for small mammals:a.moving individuals travel farther in more fragmented landscapes.b.moving individuals travel farther in less fragmented landscapes.c.more individuals move in more fragmented landscapes.d.fragmentation affects movement distance but not the likelihood ofmovement.e.fragmentation affects the likelihood of movement, but not movementdistance.arrow_forwardH5N1 and SARS are examples ofa. extinct species.b. forms of greenhouse gases.c. endangered habitats.d. emerging diseases.arrow_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_forward
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