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Exam 4: Biodiversity and Evolution

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Question 31

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A species in an ecosystem that plays a central role in the health of that ecosystem, and whose removal may cause the collapse of the ecosystem, is called a(n)

A) foundation species
B) indicator species
C) native species
D) keystone species
E) specialist species

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Question 32

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Sharks are an important part of biodiversity for all of the following reasons, except

A) they remove dead and dying fish
B) they could teach us how to not get cancer
C) they are an important food source for whales
D) they remove dead and dying aquatic mammals
E) their immune systems could teach us how to heal without becoming infected

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Question 33

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Which of the following is not an example of a cause for the decline of amphibians?

The earth's spinning on its axis prevents one side from being too hot and the other side too cold for water-based life to exist.

The loss of a(n) ____________________ species can lead to population crashes and extinctions of other species in a community that depend on it.

More plant species have been identified than any other group of organisms.

The movement of the continents influences evolution in which of the following ways?

Which of the following is another name for a nonnative species?

A change in the genetic characteristics of a population from one generation to another is called

In geologic history mass extinctions have been followed by an increase in species diversity.

Genetic engineering allows scientists to transfer genes between different species that would not interbreed in nature.

Shark species have been around for more than 400 million years.

Genetic variation in a population is the result of ____________________.

The best guess of the total number of species on earth is between __________ and __________.

The variety of processes, including matter cycling and energy flow within ecosystems, which result from species interacting with one another in food webs is called

For natural selection to occur, an adaptive trait

All nonnative species are villains.

The diversity that enables life on earth to adapt and survive environmental changes is called

Estimates indicate the average annual background extinction rate is one to five species for each million species on earth.

The role a species plays in its ecosystem is the