下列生物的亲缘关系最密切，共同特征最多的是（ ）
A．同种的生物
B．同属的生物
C．同科的生物
D．同目的生物
生物分类单位由大到小是界、门、纲、目、科、属、种．界是最大的分类单位，最基本的分类单位是种．分类单位越大，生物的相似程度越少，共同特征就越少，包含的生物种类就越多，生物的亲缘关系就越远；分类单位越小，生物的相似程度越多，共同特征就越多，包含的生物种类就越少，生物的亲缘关系就越近．如人种：黄种人、白种人、黑种人，他们相似程度多，亲缘关系就近．目、科、属、种四级分类定位中种最小．因此亲缘关系最密切，共同特征最多的是同种的生物．
故选：A．
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