What happens to any matter that is not used by consumers in a food chain?

It is decomposed by decomposers and brought back into the food chain later.

Explanation:

Decomposers like bacteria and fungi break down any amount of living and non-living organic matter that is left unconsumed in the ecosystem.

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.