What are the parts of sexual reproduction?

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Delete.  The best thing to do is to ask your parents about this question as its not best suited for the internet.  Since it is a biology question though, it depends on the species.

If its human, it would be... you know... just ask your parents

It goes by stages . The first stage of sexual reproduction, "meiosis", the number of chromosomes is reduced from a diploid number .

Cell division is important to single celled organisms because it allows the cells to reproduce. through cell division, cells make exact copies of themselves. when single celled organisms go through cell division, they make exact copies of themselves which is how they reproduce.