fertilisation - The process of male and female sex cells fusing together. , prenatal - The stage of development from the time of fertilisation to the time of birth. , gestation - The process or time when prenatal development takes place before birth. , reproduce - To produce young, asexual reproduction - A process where one parent produces new life. , sexual reproduction - A process where two parents - one male and one female - are required to produce new life. , life cycle - The changes a living thing goes through, including reproduction. , adolescence - The social and emotional stage of development between childhood and adulthood. , puberty - The physical stage of development between childhood and adulthood. , menstruation - When a female body discharges the lining of the uterus. This happens approximately once a month. , adulthood - The stages of development when a human is fully grown and mature. , life expectancy - The length of time, on average, that a particular animal is expected to live. ,

Animals (human life cycle) Key Vocabulary

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