Human Impact

Which of the following statements is true of Earth's carrying capacity?

• It is infinitely expandable.

• It was reached in the last century.

• It has been increased by technology.

• It grows larger as population increases.

Which of these is an example of a nonrenewable resource?

• sun

• water

• wind

• coal

The amount of land needed to support a person is called his or her

• nonrenewable resource.

• renewable resource.

• carrying capacity.

• ecological footprint.

The increase in global temperatures is known as

• the greenhouse effect.

• acid rain.

• global warming.

• pollution

Deformities in an aquatic indicator species can reveal the

• effect of pollutants on the species' predators.

• quality of the water in which it lives.

• biodiversity of the species in the area.

• rate of reproduction of the species.

Which level of the food chain is most affected by biomagnification?

• producers

• primary consumers

• secondary consumers

• tertiary consumers

When an ecosystem loses biodiversity, it becomes

• more efficient.

• less stable.

• easier to live in.

• fragmented.

A highway that keeps an organism from using its entire home range causes

• extinction

• an island ecosystem.

• biomagnification

• habitat fragmentation.

How can introduced species disrupt ecosystems?

• by crowding out native species

• by causing habitat fragmentation

• by increasing biodiversity

• by decreasing competition

Which of these is a way to make fisheries more sustainable?

• Reduce harvests.

• Use more fishing boats.

• Focus on only a few species.

• Catch umbrella species.