Question 1

____________________ diversity is the most obvious component of biodiversity.

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The answer of ____________________ diversity is the most obvious component...

Question 2

According to the International Union for Conservation of Nature,more than ____ percent of all known amphibian species are declining in numbers.

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The answer of According to the International Union for Conservation...

Question 3

Any heritable trait that improves the ability of an organism to survive and to reproduce at a higher rate than other individuals in a population are able to do under prevailing environmental conditions is a(n)____________________.

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The answer of Any heritable trait that improves the ability...

Question 4

New species form when one species splits into two or more different species,a process called _______________.

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The answer of New species form when one species splits...

Question 5

Approximately 200-250 million years ago,all of the earth's present day continents were connected in a super continent known as ____________________.

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The answer of Approximately 200-250 million years ago,all of the...

Question 6

Large regions such as forests,deserts,and grasslands,with distinct climates and species,are called _______________.

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The answer of Large regions such as forests,deserts,and grasslands,with distinct...

Question 7

Species that migrate into,or that are deliberately or accidentally introduced into,an ecosystem are called ____________________.

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The answer of Species that migrate into,or that are deliberately...

Question 8

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

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The answer of The loss of a(n)____________________ species can lead...

Question 9

The number of species on the planet at any time is a result of the interaction between the processes of ____________________ and ____________________.

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The answer of The number of species on the planet...

Question 10

Species that are only found in one area are called _______________ and are especially vulnerable to extinction.

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The answer of Species that are only found in one...

Question 11

A(n)____________________ is a significant increase in extinction rates above the background level.

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The answer of A(n)____________________ is a significant increase in extinction...

Question 12

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

Accepted Answer

Mass extinctions remove dominant species, which opens up ecological niches. This allows surviving species to diversify and adapt to new environments, leading to an increase in species diversity over time.

Question 13

The world's entire body of discovered fossils is called the ____________________.

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The answer of The world's entire body of discovered fossils...

Question 14

Keystone species have a large effect on the types and abundances of other species in an ecosystem.

Accepted Answer

Keystone species play a critical role in maintaining the structure of an ecological community, affecting many other organisms in the ecosystem and helping to determine the types and numbers of various other species in the community.

Question 15

A temperate rain forest is likely to have high species evenness and low species richness.

Accepted Answer

A temperate rainforest typically has high species richness due to the variety of habitats and niches available, but it may have lower species evenness because certain species, adapted to the specific conditions of the rainforest, can become dominant, outcompeting others.

Question 16

Charles Darwin and ____________________ both came up with the concept of natural selection as the mechanism for biological evolution.

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Question 17

Even if a beneficial heritable trait is present in a population,the population's ability to adapt may be limited by its ____________________.

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Question 18

Genetic variability in a population is the result of ____________________.

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Question 19

Estimates indicate the average annual background extinction rate is one species lost for each million species on earth per year.

Accepted Answer

This rate, often referred to as the "background" or "natural" rate of extinction, is a baseline against which current, human-driven rates of extinction can be compared. It suggests that naturally, without human influence, we would expect to lose about one species per million species per year.

Question 20

Under rapidly changing environmental conditions it is better to be a specialist species.

Accepted Answer

Specialist species, which rely on a narrow range of food sources or very specific habitats, are less adaptable to change and thus more vulnerable under rapidly changing environmental conditions compared to generalist species, which can exploit a wider variety of resources and habitats.

Quiz 4: Biodiversity and Evolution