Which two of the following organisms are decomposers in this food web?

plainfin midshipman
sea cucumber
zooplankton
bat star
black rockfish

Sea cucumber and bat star.

To identify the decomposers in the food web, we need to know which organisms primarily play the role of breaking down organic matter. Decomposers are responsible for releasing nutrients back into the ecosystem.

In the given list of organisms, the two decomposers are:
1. Sea Cucumber: Sea cucumbers are known for their ability to feed on organic matter and decompose it through their feeding habits.
2. Zooplankton: Zooplankton, being microscopic animals, are an important part of the food web and play a crucial role in decomposing dead organic matter.

Therefore, the two decomposers in the food web are the sea cucumber and zooplankton.