Environmental Change

Which is NOT an example of a natural environmental change?

• a beaver dam

• a hurricane

• a volcanic eruption

• a housing development

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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Which of these populations is most likely to decrease if the number of grasshoppers decreases?

• plants

• frog

• praying mantis

• owl

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A foreign insect is introduced into the Texas. It eats a lot of leaves, and trees start to become leafless. Many different animals feed on the new insect, but even they cannot control its numbers. Eventually, trees begin to die. Why would a rapid increase of the new insect population cause certain species of herbivores to vanish or be fewer in number?

• They would not have enough to eat. 

• They would not have enough space to live.

• They would not have tree bark to eat.

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A manatee is a water-dwelling herbivore on the list of endangered species. If manatees were to become extinct, what would be the most likely result in areas where they had lived?

• Certain producer organisms would become more abundant in the area.

• Other manatees would move into the area and restore balance.

• Predators in the area would have more food to eat.

• The area would not be affected.

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Raccoons eat aquatic animals. If chemicals entered the lake with rain water and destroyed the plants, how would this impact the raccoon population?

• Raccoons would have more aquatic animals to eat.

• Raccoons would begin eating land plants.

• Raccoons would have less aquatic animals to eat.

• Raccoons would only drink water.

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There are many large-mouth bass, a type of fish, living in a small lake near Waco, Texas. How would increased fishing in the lake effect the lake ecosystem?

• Predators of the bass might starve due to loss of a food source

• The population of the bass’ prey would decrease.

• The bass would spend more time swimming near the surface

• Water level in the lake would decrease as more fishing took place

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when animals graze so much that the vegetation is damaged

• impact

• overpopulation

• overgrazing

• fertilize

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All the living and nonliving things in a place make up the _______.

• drought

• enviroment

• soil

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Which can change an environment in minutes?

• a beaver dam

• a forest fire

• a growing plant

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