Global Change — Unit test Answers

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Ecosystems change when _______.

living components of an ecosystem change

nonliving components of an ecosystem change

their stability is disrupted

all of the above

Greenhouse gases are best described as _______.

the result of fossil fuel use

gases that cause the greenhouse effect

carbon dioxide and methane

gases that trap energy from the sun in Earth’s atmosphere

Between 1940 and 1970 most scientists were already concerned about global warming.

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