Answer:
Your bloodstream.
Explanation:
The cells in your pancreas produce insulin which needs to be sent to the rest of your body to tell your cells to take in glucose (sugar) for energy. In order to get sent out of the pancreas' cells, the insulin needs to go through your bloodstream.
C. DNA codes for RNA which codes for proteins
The third option, "other fungi growth".
Hydrogen, for example, it gives trees inter molecular force.