下图为草履虫的结构示意图，请据图回答有关问题：（1）草履虫以细菌和微小浮游植物为食，食物从口沟进入形成标号所示结构，随细胞质流动逐渐被消化；不能消化的食物残渣从（结构-七年级生物

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• 单细胞生物仅由一个细胞构成，却能独立完成、、、等各种生命活动。-七年级生物
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