Human Development from Birth to Death: It goes without saying that conception is the first stage of human development.
Stages
1 The time before conception.
2 Birth. A baby's birth marks the start of their journey through life.
3 Childhood. Ages 0 to
4 are when this stage occurs.
5 Very young age. This phase of human development lasts three to four years.
With advancing years, the human body also experiences interior changes. Some such modifications include: decreased performance of internal organs including the liver and kidneys. There is a loss of muscle mass. Bones become more porous as viscera and bone density decline.
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