低等的动植物是由原始单细胞生物经过漫长的年代逐渐演变而来的,

低等的动植物是由原始单细胞生物经过漫长的年代逐渐演变而来的,这些原始单细胞生物的生活环境是在(   

A.原始陆地上        B.原始海洋中        C.原始江河中       D.原始高山上

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