Biology and Earth Science – Forces, Magnetism, Moon Phases, Microbiomes, and Ecosystems Practice Test

Stability means a system stays largely the same over time, keeping its structure, processes, and overall balance even when small disturbances occur. In ecosystems, a stable system maintains similar species composition and energy flow, with populations that don’t swing wildly and a nutrient cycle that keeps working as before, returning to a typical state after minorups and downs. This is why the idea of staying mostly unchanged over time fits best.

The other ideas don’t capture that sense. Change describes something that varies over time, not staying the same. Energy is about the capacity to do work and how energy moves through a system, not about remaining constant. A food web is a network of feeding relationships, which can shift as species come and go, so it doesn’t inherently imply staying the same.