单选题：流程图可用来表示连续发生的一系列生理活动。以下流程图正确的是（　　）。

题目分类：初中生物
题目类型：单选题
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题目内容：

流程图可用来表示连续发生的一系列生理活动。以下流程图正确的是（　　）。 A．外界空气进入肺部：鼻→咽→喉→支气管→气管→肺
B．尿液的形成和排出：肾脏→膀胱→尿道→输尿管→体外
C．食物通过消化道：口腔→咽→食道→胃→小肠→大肠→肛门
D．果实和种子的形成：种子萌发→植株生长→开花→受精→传粉→结果

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