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Biologists Link Sexual Selection and Placenta Formation（图）
The placenta. Fish The peacock. Mammals Organs Out of nothing guppy
2014/7/18
RIVERSIDE, Calif. — Sexual selection refers to species’ selection for traits that are attractive to the opposite sex. This special type of natural selection enhances opportunities to mate, the tail of...
《The Descent of Man, and Selection in Relation to Sex》Chapter VIII Principles of Sexual Selection
The Descent of Man, and Selection in Relation to Sex 人类由来与性选择 查尔斯·达尔文 Charles Darwin
2008/12/22
WITH animals which have their sexes separated, the males necessarily
differ from the females in their organs of reproduction; and these are
the primary sexual characters. But the sexes often diffe...