Biology

The kingdom that contains only heterotrophs is B.Animalia.

Animalia: All organisms in the Animalia kingdom are heterotrophs, meaning they obtain their food by consuming other organisms (either plants or other animals). Animals are incapable of photosynthesis and rely on other organisms for their energy.

Here's a breakdown of the other kingdoms:

A.Protista: This kingdom includes both autotrophs (such as algae, which perform photosynthesis) and heterotrophs (such as protozoa, which consume other organisms).