You find a Saskatoon bush growing wild that has large, sweet berries. What could you do to produce more bushes that have exactly this kind of berry?

Selective breeding.

Explanation:

Selective breeding method is used in order to produce more bushes that have the same kind of berries. In this method, Saskatoon bush which is a wild bush can be crossed with another bush belongs to the same family so the new seeds produced having the characteristics of Saskatoon bush and is able to produce large and sweet berries just like berries of Saskatoon bush.

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."