AnswersScience 7 B M12 2526 S2Unit Test

Unit Test — Unit test Answers

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Which statement best describes long-term environmental changes?

A
They occur suddenly.
B
They do not typically cause changes to DNA.
C
They cannot occur gradually.
D
They can occur anywhere from thousands to billions of years.
22
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Which situation is an example of a human-induced environmental change affecting a population?

A
Blue jays no longer live in a forest because the trees in the forest were cut down.
B
A volcanic eruption killed grasses that were growing within a few miles of the volcano.
C
Floods from a storm forced many white-tailed deer to move to a new habitat.
D
A fisher caught a few different species of fish that live in an ocean habitat.
23

The chart shows information about four ecosystems. Ecosystem Data EcosystemAverage Year-Round Temperature (°F)Niche DiversitySize (square miles)W35medium140X74high100Y46high75Z87low60

A
W
B
X
C
Y
D
Z
24

Which statement best compares pioneer species with climax communities?

A
Both are involved with stages of succession, but climax communities are the beginning and pioneer species are the end result.
B
Both are involved with stages of succession, but pioneer species are the beginning and climax communities are the end result.
C
The appearance of each indicates that the number of species in the area is increasing.
D
The appearance of each indicates that the number of species in the area is decreasing.
25

Which chemicals are major contributors to ozone layer destruction? Select two answer choices.phosphorusnitrogenbrominechlorinecarbon dioxidemethane

A
phosphorus
B
nitrogen
C
bromine
D
chlorine
E
carbon dioxide
F
methane

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