16 points how did cyanobacteria affect earth’s early atmosphere? a. they replaced oxygen with carbon dioxide in the atmosphere. b. they eliminated the harmful ultraviolet rays of the sun. c. they replaced carbon dioxide with oxygen in the atmosphere. d. they absorbed ozone molecules from the atmosphere.
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Biology, 22.06.2019 10:00, naynay4evr
In which squares should the phrase "green pods" appear a) a and d b) b and e c)a, c, and d d)a, b,c, d and e
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14. which of the following codons code for threonine? a. ucg b. ugu c. cga d. aca
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Hairs that clean dirt out of the air in your nasal passages are called: a. sinus b. trachea c. cilia d. mucus
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16 points how did cyanobacteria affect earth’s early atmosphere? a. they replaced oxygen with carbo...
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English, 16.03.2020 20:47