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.
Answer:
science or scientist?
Explanation:
Destructed environment
Lack in gov. funding
Out of use technology (outdated)
I think under 6 seconds
3rd
Cellular respiration occurs only in animals
Answer: road pipeline