Answers2026 Summer 305 CR_2002070-MJ Comprehensive Science 2Human Impact on the Environment

Human Impact on the Environment Answers

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Which statements describe global warming? Select two answer choices.Global warming can be decreased through deforestation.Global warming occurs naturally.Global warming results from the buildup of nutrients in runoff.Global warming is likely increased by humans.Global warming is enhanced by nonnative species.

A
Global warming can be decreased through deforestation.
B
Global warming occurs naturally.
C
Global warming results from the buildup of nutrients in runoff.
D
Global warming is likely increased by humans.
E
Global warming is enhanced by nonnative species.
2
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Which situation is an example of nonnative species introduction?

A
A huge volcanic eruption in Washington destroyed many habitats.
B
A large oil spill in the Gulf of Mexico killed many organisms that lived there.
C
Horseshoe crabs in the waters of Virginia have been overfished, and their numbers have declined.
D
Water hyacinths from Asia now grow in the United States and are crowding out animals and other plants.
3

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
4

Leon made a study chart about human-induced changes to the environment. Environmental Changes Caused by HumansXYResults from introducing harmful substances into the environmentExample: oil spillResults from natural areas being cleared and replaced by human developmentExample: deforestation

A
X: Habitat DestructionY: Pollution
B
X: Long-Term ChangesY: Short-Term Changes
C
X: Short-Term ChangesY: Long-Term Changes
D
X: PollutionY: Habitat Destruction
5

Which of the following shows the order of events that scientists believe will likely lead to the disappearance of many species?

A
increase in human population, increase in short-term human-induced changes, ozone layer destruction
B
increase in short-term human-induced changes, increase in human population, ozone layer destruction
C
increase in human population, increase in short-term human-induced changes, mass extinction
D
increase in short-term human-induced changes, increase in human population, mass extinction
6

Which of these organisms have been negatively affected at the species level due to human-induced environmental changes?

A
zebra mussels and kudzu
B
kudzu and dodo birds
C
zebra mussels and Caribbean monk seals
D
Caribbean monk seals and dodo birds
7

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.
8

Which statement best explains how deforestation affects organisms?

A
It increases the amount of carbon dioxide in the air, enhancing global warming.
B
It reduces the amount of carbon dioxide in the air, enhancing global warming.
C
It reduces the amount of carbon dioxide in the air, enhancing ozone layer destruction.
D
It increases the amount of carbon dioxide in the air, enhancing ozone layer destruction.
9

Which of the following are effects of environmental change on populations?

A
speciation and a decrease in resources
B
loss of habitat and impacts on growth and development
C
a decrease in resources and loss of habitat
D
speciation and extinction
10

Which statements describe a human-created mass extinction? Select three correct choices.It results from the disappearance of entire species in a short time.It results from the disappearance of a few organisms in a short time.It is caused by the growth of the human population.It is a type of long-term change.It is a type of short-term change.It is caused by a decrease in the introduction of nonnative species.

A
It results from the disappearance of entire species in a short time.
B
It results from the disappearance of a few organisms in a short time.
C
It is caused by the growth of the human population.
D
It is a type of long-term change.
E
It is a type of short-term change.
F
It is caused by a decrease in the introduction of nonnative species.

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