問題詳情
21. The evolution of organisms that use oxygen in their respiration was possible only because of the action of a group ofbacteria that produced oxygen and changed the Earth's atmosphere from an anoxic one to one rich in oxygen. That groupof bacteria was:
(A) actinobacteria
(B)spirochaetes
(C)proteobacteria
(D)Staphylococcus
(E) cyanobacteria
(A) actinobacteria
(B)spirochaetes
(C)proteobacteria
(D)Staphylococcus
(E) cyanobacteria
參考答案
無參考答案
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