下列有关生态系统结构的叙述,正确的是 A.每种生物在生态系统中

下列有关生态系统结构的叙述,正确的是

A.每种生物在生态系统中只能处在一个营养级上

B.动物都属于消费者,其中食草动物处于第二营养级

C.自养生物都是生产者,是生态系统的主要成分

D.细菌都属于分解者,其异化作用类型有需氧型和厌氧型两类

答案

C

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