Here's why:

* Animal-like protists are classified as protozoa. They are heterotrophic, meaning they obtain their food by consuming other organisms.

* Decomposers are organisms that break down dead organic matter, like plants and animals.

* Some protozoa are saprozoic, meaning they feed on dead organic matter. These protozoa play a role in decomposition.

Examples of decomposer protozoa:

* Amoeba can engulf and digest dead bacteria and other organic matter.

* Some flagellates feed on decaying plant material.

Other protozoa are predators, feeding on other living organisms, such as bacteria, algae, or even other protists. These are not decomposers.

Therefore, while some animal-like protists act as decomposers, not all of them do.