What type of organisms are primarily found in the kingdom Animalia?

The correct choice identifies organisms in the kingdom Animalia as heterotrophic and multicellular. Organisms within this kingdom are characterized by their reliance on other organisms for food, meaning they cannot produce their own organic matter through photosynthesis like autotrophs do. This heterotrophic lifestyle encompasses a vast array of dietary habits and feeding mechanisms.

Multicellularity is another defining trait of the organisms in Animalia. Animals consist of multiple cells that are organized into tissues, organs, and systems, allowing for complex structures and functions. This contrasts with unicellular organisms, which are single-celled and do not exhibit the same level of biological organization.

In summary, the defining features of the kingdom Animalia as heterotrophic and multicellular underscore the complexity and diversity of life forms that fall under this classification, encompassing everything from sponges to mammals.