Adolescent - The period when a young person changes into an adult, Adult - A person who is fully grown or developed, Child - A young person below the age of puberty, Foetus - An unborn or unhatched offspring of a mammal, Gestation - The period of developing inside the mother's womb, Reproduction - The production of offspring, Life expectancy - The average age that you might expect to live to, Infant - A baby under 1 year old, Naturalist - An expert who studies plants and animals, Species - A group of similar organisms that are able to reproduce , Geriatric - Relating to elderly people, Womb - The organ in which the female carries and grows a foetus, Toddler - A young child learning to walk,

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