Question

which two characteristics describe all animals?
multicellular and symmetrical
multicellular and asymmetrical
heterotrophic and multicellular
heterotrophic and unicellular

Explanation:

All animals are heterotrophic, meaning they cannot produce their own food and must consume other organisms for energy. Additionally, all animals are multicellular; there are no unicellular animals (unicellular heterotrophs like protozoa are not classified as animals in modern taxonomy). Symmetry is not universal, as some animals (e.g., sponges) are asymmetrical, so symmetry-based options are invalid. Unicellular is incorrect because animals are multicellular by definition.

Answer:

heterotrophic and multicellular