Are all multicellular animals heterotrophs or not?

Nope. Heterotrophs must obtain their energy by eating other organisms. While most heterotrophs are multicellular, Autotrophs can be too. Autotrophs have the ability to convert outside sources to usable energy (photosynthesis or chemiosynthesis). This does not mean that they are single-celled animals. read more

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Almost all animals are multicellular for their entire life cycle—OK, except for the fertilized egg stage. But there is a group of parasites that is descended from multicellular ancestors, but whose bodies are so highly reduced that they were grouped with the unicellular protists for a long time. read more