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Human Ageing

life3stages_1

All human beings have a life cycle. This means that they go through a series of changes from the moment they start life to the moment they die.

The process of change is natural and all living things undergo it. The body changes a lot in a short time during puberty which normally happens between the ages of 10-18 years old.

​​​​​​​There are different changes for boys and girls:

​​​​​​​Boys​​​​​​​Girls
Start to grow hair on their facesBreasts develop and get larger​​​​​​​
​​​​​​​Start to grow hair on their bodies e.g. chest, armpits, groin​​​​​​​​​​​​​​​​​​​​​Start to grow hair on their bodies e.g. armpits, groin​​​​​​​
​​​​​​​Start to produce sperm in the testicles​​​​​​​Start to release eggs from the ovaries once per month. This causes monthly ‘periods’​​​​​​​
​​​​​​​​​​​​​​Voice ‘breaks’ and becomes lower pitched​​​​​​​​​​​​​​Hips widen to prepare for childbirth

The gestation period of a human is 9 months (time taken between fertilisation and birth). What is the equivalent time for an elephant?

Follow these hyperlinks to learn more:-

  1. BBC Bitesize Life Cycles
  2. BBC Videos on Life Cycles
  3. Dorling Kindersley Life Cycles

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