the life history of an organism can be summed up as "gametic fusion,equational division and reductional division " explain the statement

The life of an organism starts when a sperm and egg cell fuses forming a zygote. Thus, gamtic fusion leads to the beginning of life. After the gametic fusion, the zygote tends to divide mitotically (equational division) to growth and develop. Evan after the birth of the child, mitosis occurs for growth and development. The third division that occurs is reductional division. When a child reaches puberty, gametes are produced in the body in which reductional division occurs. 

Hence, the life history of an organism can be summed up as "gametic fusion,equational division and reductional division.

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