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語呂合わせ依頼者より How many weeks' holiday a year are there? http://levitra-20mg.in.net/ levitra 20 mg Whatever the initial reason and whenever it evolved, monogamy has been a boon for Homo sapiens. The study pointing to protection from infanticide as the prime force in male monogamy "allows us to peer back into our evolutionary past to understand the factors that were important in making us human," said Susanne Shultz of the University of Manchester, a co-author of the PNAS paper. "Once fathers decide to stick around and care for young, mothers can then change their reproductive decisions and have more, brainy offspring." by Quentinさん

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