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类人猿 类人猿也叫做猿类，包括大猩猩、黑猩猩、猩猩和长臂猿等，是灵长目猩猩科和长臂猿科动物的总称。这些动物因与人类的亲缘关系最为接近，形态结构也与人类十分相似，所以统称类人猿。类人猿是灵长目中除了人以外最为高等的动物。类人猿与人类最为相近的体质特征是：具有复杂的大脑和宽阔的胸廓，具有盲肠、蚓突以及扁平的胸骨。此外，类人猿在牙齿的数目与结构、眼的位置、外耳的形状、血型以及怀孕时间和寿命长短等方面与人类也十分相近。但是，类人猿具有前肢长于后肢、半直立行走以及善于臂行等特点，这些则与人类具有明显的区别。 思考：类人猿在形态结构上确实与人有许多相似，但究竟在哪些方面和人有根本的区别？
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