A zygote consists of only one cell. Thus, the correct option is A.
What is Zygote?
Zygote may be defined as a type of cell which is formed by the union of two different gametes. It is also known as a fertilized ovum.
After successful fertilization of two different gametes, the zygote begins as a single cell and divides rapidly on successive days.
The single cell of the zygote contains all the mandatory chromosomes that receive from both gametes.
Therefore, a zygote consists of only one cell.
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