The Evolution of Human Reproduction

摘要: Mammals exhibit a variety of density-dependent reproductive variables that enable them to come into equilibrium with their environment. These include the age at puberty, extent embryonic and foetal death, neonatal mortality rate, duration lactational anoestrus or amenorrhoea. are all female-oriented mechanisms; most mammals polygynous, as female has greatest energy investment in reproduction she is limiting resource. Unfortunately, man species chosen eliminate these constraints, so we now without any natural checks balances on our rate population growth. We will be entirely dependent artificial forms contraception for evermore. Since selection always operated past maximize potential, women physiologically ill-adapted spend greater part lives non-pregnant state. Tomorrow9s contraceptives need great care, they have considerable impact general health social well-being.