C.
Biotic mean alive, so we can cut off the first 2 easily. Aquatic birds eat frogs, so that one is safe for now. A decrease in something parasitic usually helps the population, so D is out too. The only one left is C.
<span>Carbon-based macromolecules are found in all life forms.</span>
If your findings disproves your hypothesis then your hypothesis is probably wrong.
Jfjdshbfuskdgfdihkb gfkudshncfuihfnierd
