The answer and why.

This is a wetland food web. When the organisms you see here die, they become food for _________. which help recycle matter back into the food web.

The blank can be filled with "decomposers" as they would help recycle matter back into the food web. Decomposers are organisms such as bacteria and fungi that break down dead plants and animals into simpler substances. This process releases nutrients back into the ecosystem, which can then be used by other organisms in the food web.