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assuming you mean a sperm and not a cingular cell of a sperm, it is about 1/18th the size of an ovum.
About 10000 sperm cells are ejaculated but only 1 can fertilize an egg cell.
A sperm is a haploid of 22 autosomes and 1 sex cell. So it gives the embryo half of its DNA.
Sperm cells are animal cells.
A sperm is a single cell, so there is one cell per sperm.