Question

how could a single cell become such as a big individual

Answer 1

hey mate
The single cell formed after the combination of sperm and egg is called a zygote.It is the first cell of an individual which undergoes cell division to give rise to a complete individual.Therefore, a single cell becomes a individual by cell division

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Answer 2

The single cell formed after the combination of sperm and egg is called as zygote. It is the first cell of an individual which undergoes cell division to give rise to a complete individual. There are several developmental stages involved in this process