The most primitive mammals,the ______________,are oviparous like their reptilian ancestors.
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Q41: Most mammals,most cartilaginous fish,some amphibians,and a few
Q42: The monthly cycle of a human female
Q43: During which period of prenatal development is
Q44: The portion of the Y chromosome that
Q45: _ is the male sex hormone,responsible for
Q47: Why are shelled eggs evolutionarily advantageous?
Q48: The muscular ring at the base of
Q49: Sperm,together with the secretions from several other
Q50: Why are the testes suspended outside the
Q51: What are the advantages of internal fertilization?
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