Question

In a food web, a key organism is generally absent. What is it?

Answer 1

In a food web, generally no decomposer organism is depicted.
Decomposers are very important for recycling of matter in an ecosystem as they break down dead and decaying organisms.

Explanation:

You please read the answer in the following link to understand the role of decomposers in an ecosystem:

https://socratic.org/questions/why-are-decomposers-so-important-to-an-ecosystem?source=search