Answer:
Change in the species structure of an ecological community over time. (A)
Explanation: Google
Yes. Indirectly, through plants. Without plants using photosynthesis, and therefore, creating oxygen, we wouldn't have enough breathable air.
H2O hzhjxjdhdjjdhdhhd i guessed sorry it might be wrong
I believe the correct answer is upwelling. Lets say we have producers such as plankton. well upwelling currents bring dead matter from the ocean floor up to the surface, creating plankton.
