Question

Unlike matter, energy is not cycled through an ecosystem:

Answer 1

true or false?

Answer 2

Energy does not cycle through a system but instead enters ecosystems and is used up within them. Hence why we have the Food Chain and not the Food Cycle.

Answer 3

Energy is a subtle concept. I would argue that energy does travel cyclically through the ecosystem - in as much as energy is stored in chemical bonds in molecules, and those molecules are transferred from one organism to the next in a cyclic manner.

Answer 4

Reality is kind of half-way in-between. Any energy that interacts with a system is irreversibly degraded, at least in part, to a lower form of energy, eventually ending up as useless background heat.

As such, energy can at best "spiral" through a system, always eventually heading down and out. It cannot perpetually cycle within the system.

I would say this makes the best answer to the question "true", but that's "true with qualifications".