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Although all cells have the same DNA only some parts of it are turned on depending on what the cell needs to do, so each cell turns on different parts of itself depending on what its job is. Hope this helps!

Answer:

A - The DNA in all cells is the same. The cells will specialise as a certain type (ie skin or nerve) and this 'turns off' certain genes that are not relevant to the function of that particular cell and expresses others which tell the cell how to grow and what chemicals to produce.

Explanation:

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