Changes in Environments

Tropical rainforests are cut down and burned at a very high rate in many parts of the world. An area the size of a football field is destroyed every second of every day. The burning wood and vegetation release large amounts of carbon dioxide. Fewer plants remain to take in carbon dioxide. How does this burning affect the carbon cycle in tropical rain forests?

• More carbon dioxide is released into the atmosphere

• More carbon dioxide is stored in animals

• More carbon dioxide is released into the soil

• More carbon dioxide is stored in plants

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All of the following are ways humans can adversely change the ecosystem EXCEPT—

• waste dumping

• using biodegradable products

• overhunting animals

• industrial pollution

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What effect would building a highway have on an ecosystem?

• Increase in butterfly migration

• Decrease in destruction of habitat

• Increase in carbon dioxide

• Increase in oxygen

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Overpopulation animals cause severe damage to an ecosystem and the surrounding landscape. Additionally, overpopulation can affect the food chain, water routes, and land. Based on the information provided, which of the following is the best conclusion about the effects of overpopulation?

• Overpopulation is destroying the entire U.S.

• Overpopulation does not impact the food chain

• Overpopulation can change the entire structure of the ecosystem

• Overpopulation causes serious issues with the water cycle

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Hunting is an environmental management tool that helps control wildlife populations. Hunting is an example of—

• the deer population creating change in an ecosystem

• the food chain creating change in an ecosystem

• humans creating change in an ecosystem

• a cycle creating change in an ecosystem

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Which activity by people puts the greatest number of animals at risk for becoming endangered?

• starting forest fires

• destruction of habitat

• hunting and fishing

• making pets of wild animals

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What is an effect of cutting down forests for the development of land and cities?

• increase in amount of oxygen

• decrease in energy provided for producers

• lack of habitat areas for plants and animals

• gain of habitat areas for new species of animals and plants

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A group of students is exploring the causes of change in the physical structure of a forest ecosystem. Each student in the group makes a prediction of how changes will impact the ecosystem. The students have each—

• made a table

• formed a hypothesis

• developed a model

• planned an experiment

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Teresa and Rafael each set up a terrarium for a class project. Teresa never had to add water to her terrarium, but Rafael had to water his every other day. Why do you think this happened?

• Teresa poured more water in hers before closing it up

• Rafael used different plants in his terrarium

• Rafael left the top off and the water inside evaporated quickly

• Teresa used more plant food than Rafael did

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Based on the information given in the table, why do overpopulated animals wander?

• Their natural ecosystem can no longer support them

• They migrate to compete with other species for garbage

• Their natural ecosystem has a vast supply of food and water

• They migrate to areas where there are fewer producers

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