Biology, 01.09.2020 18:01 ElegantEmerald

1. For each missing word or phrase, circle the choice that correctly completes the sentence. The three main gases that trap heat in Earth's atmosphere are (carbon dioxide / oxygen / nitrogen / hydrogen), methane, and water vapor. They contribute to the (climate / ecosystem / greenhouse / biosphere) effect, which makes Earth's temperatures warmer than they would be otherwise.

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1. For each missing word or phrase, circle the choice that correctly completes the sentence. The thr...