Mammals can be divided into the large intestine and rectum colon, rectum directly to anal opening in vitro (cloaca disappear), mammals and amphibians, reptiles, birds of the significant differences.
英
美
释义
哺乳动物的大肠可分为结肠与直肠,直肠直接以肛门开口于体外(泄殖腔消失),是哺乳类与两栖类、爬行类、鸟类的显著区别。
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