Environmental Changes

How do beavers change the environment?

• they build mounds

• they release poison

• they build dams

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It causes rivers to rise higher and higher:

• erosion

• drought

• flood

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They caus flame, heat, smoke, and ash, as a result they can change ecosystems:

• erosion

• fire

• flood

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How do termites change ecosystems?

• building dams

• releasing poison

• building mounds

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One positive effect of _________ is that some pinecones only open after being heated.

• fires

• erosion

• drought

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Where there is not enough rain, _____________ can hurt crops.

• drought

• flood

• erosion

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A change in the environment can cause an animal to lose its ________________

• color

• habitat

• adaptation

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Which of the following would have a negative impact on an ecosystem

• constructing highways

• planting trees

• recycling paper

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6. A squirrel makes a change to its environment when it —

• climbs a tree

• digs a hole to bury an acorn

• collects acorns

• jumps from tree to tree

What factors would cause an increase in the Wolves population between 1969-1979?

• Disease(canine parvovirus)

• Decrease in the Moose population

• Tick infestation

• Mild winters

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