Question

which animal is autotrophic in nature it can be unicellular or multicellular

Answer 1

These tiny organisms are unicellular, composed of only a single cell. The familiar plants, animals and fungi that we can see represent only a tiny fraction of life on Earth. These organisms, being made of more than one cell, are called multicellular.
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Answer 2

Autrotrophic organisms are those which can make their food by themselves but animals are heterotrophic nd obtain their food from autotrophs. Hence no animal is Autrotrophic in nature.