Is a ameba heterotrophic or autotrophic?

Ameba is heterotrophic.

Autotrophs (from Greek autos = self, trophe = nutrition) make their own food by taking energy from the environment (sun light or other chemicals). These include plants and algae or anything with chlorophyll.

Heterotrophs (from Greek heteros = other, trophe = nutrition) get their energy by eating other living things. Ameba is a heterotroph since it eats smaller animals and plants.