Question

which forest layer has a community built around decomposition?
canopy
understory
floor
emergent layer

Explanation:

The forest floor layer has a community built around decomposition. Decomposers like fungi, bacteria, and detritivores break down dead organic matter (leaves, branches, animal remains) on the forest floor. This decomposition recycles nutrients back into the soil, which is crucial for the forest ecosystem. Other layers like the emergent layer (top - most with tall trees), canopy (main layer of tree crowns), and understory (shorter trees and saplings) have different dominant ecological processes such as photosynthesis - dominated energy capture rather than decomposition - centered community structures.

Answer:

Floor