如图所示为水螅的纵切面和涡虫示意图据图回答图中食物由 进入在 消化食物残渣由 排出.2水螅特有的捕食和防御的利器 Template




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tomski如图所示为水螅的纵切面和涡虫示意图据图回答图中食物由 进入在 消化食物残渣由 coloring