Think of Saturn.
In this book, some people travel to a gas giant with rings and find an ecosystem in the rings of a planet. It has predators and prey. It has plants and animals. Autotrophs and Heterotrophs. Here are details of the organisms living here.
-they are Autotrophs
-They absorb nutrients slowly from nearby rocks by roots. They anchor themselves to multiple rocks by a strong root system, they break occasiqnly.
-They reproduce by extending roots to other rocks too. Like a quaking aspen.
-They get energy from the nearby star.
-They are adapted to low gravity, no atmosphere, low nutrients (high nutrient, including oxygen, in rocks).
-They Are Heterotrophs
-They are adapted to low gravity, low nutrients, and no atmosphere.
-They get all energy from plants and other animals.
-They are adapted to jump to rock to rock.
-Extremly strong exoskeleton to withstand the vacuum of space.
-They communicate by vibrations through rocks, thus being on same rock to communicate.
-Reproduce by laying eggs under rocks in asteroids.
-They go around in packs.
-Packs attack other packs.
Now my question is with all their adaptations, could they even exist?