問題詳情
53.Which is not characteristic of all mammals?
(A)having glands to produce nourishing milk for offspring
(B)giving birth to live young (viviparous)
(C)a four-chambered heart that prevents mixing of oxygenated and deoxygenated blood
(D)having a diaphragm to assist in ventilating the lungs
(E)having hair during at least some period of life
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