What is the purpose of the G2 phase of interphase

G2 phase is where the cell grows again, and prepares for mitosis. This phase allows cells to produce new protein. Although this phase is not a necessary part of the cell cycle.

Explanation:

a: the sheep and waste material both release carbon into the atmosphere.

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