Greenhouse gases ________. a. Slow the escape of heat from Earth into space b. Are produced by

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Greenhouse gases ________.

a. Slow the escape of heat from Earth into space

b. Are produced by natural and human activities

c. Are at higher levels than they were 100 years ago

d. All of the above

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Human Biology

ISBN: 9781305264540

11th Edition

Authors: Cecie Starr, Beverly McMillan

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