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【单选题】
下列关于生物进化的叙述正确的是( )A.
化石是研究生物进化的唯一证据
B.
“化学进化学说”认为“原始生命是在原始海洋中出现的”
C.
生物进化的总体趋势是由体型小到体型大,由低等到高等,由水生到
D.
植物的进化趋势是由有性生殖到无性生殖
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