D. Biomass can be regrown quickly
The answer would be D, as even though both velocity and speed may share similar resultants in this scenario, speed is a scalar, while velocity is a vector. Thus, velocity can have direction and move negatively (the opposite direction from which it started) while speed is a measurement of quantity.
Sunlight (it is used by zooplankton which are the bases of all life in the marine ecosystem)
Answer:
I believe it's ecological succession.
Hope that helps!