Global Change Answers

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Which of the following could cause a habitat change?

introduction of an invasive species

a wildfire

a mudslide

all of the above

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Pollution is the only way that humans can cause changes to ecosystems.

How does change to an ecosystem that results in succession benefit the ecosystem?

it leads to an increased level of biodiversity

it leads to decreased productivity

it ends symbiosis between organisms

it allows ecosystems to operate independently of each other

Ecosystems have trouble adjusting to short-term changes.

Fish populations and other aquatic resources are likely to be affected by changes in what aquatic factors?

water temperatures

disease

water quality

all of the above

Which scenario best describes how climate trends might affect animal migration?

Animals found in the Arctic may move south.

Animals found at the equator may move north.

Animals found in higher elevations will move to lower elevations.

Animals found in lower elevations will stay in the same location.

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Habitat change can occur through natural causes.

What effect can fertilizer runoff have on an aquatic ecosystem?

increased plant growth leading to a decrease in fish populations

increased plant growth leading to an increase in fish populations

decreased plant growth leading to a decrease in fish populations

decreased plant growth leading to an increase in fish populations

Which of the following is not a possible effect of rising carbon dioxide levels on plants?

increased photosynthesis

increased plant mortality

increased crop productivity

increased plant growth

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