A. How many cells are present at the beginning of mitosis?

The answer is one cell.

Mitosis is a cell division of a single cell into two identical daughter cells. So, at the beginning of mitosis, there is only one cell. It will undergo different stages of mitosis (prophase, metaphase, anaphase, telophase and cytokinesis) which will result in the formation of two daughter cells that are identical to the mother cells.

Explanation:

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Can I have brainliest please?

the sun creates it's own light, also gives light and life to bunch of stuff like plants,animals,humans etc.photosyntesis is the process of making food which needs sun,water,nutrients etc.