Answer:
A, the populations of producers and decomposers should be stable
Explanation:
The other three do not fit, only reasonable one is A
Lots of hand waving as is in the current field of much of molecular biology. Other than that experiments and observations. Basically the utilization of the scientific method and then trying to find the mechanism by which something occurs through even more research/experimentation.
HOPE THIS HELPS
Well if the ball was to turn, slow down, or speed up, that would be acceleration.
Structurally, Plant And Animal Cells