What do cells have to reproduce through in order to grow or repair damaged cells'?

I have this homework that asks me to fill in the blanks and there is this one I dont know the answer to. Heres what it says.For an animal to grow or r

I have this homework that asks me to fill in the blanks and there is this one I don't know the answer to. Here's what it say's.

For an animal to grow or repair damaged cells, the cells have to reproduce through_______.

Plz help

or:I have this homework that asks me to fill in the blanks and there is this one I don't know the answer to. Here's what it say's.For an animal to grow or repair damaged cells, the cells have to reproduce through_______.Plz help

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