Question

what are autotrophs, heterotrophs and decomposers

Answer 1

autotrophs are those who make their own food by process of photosynthesis
heterotrophs are those which depends on other to obtain food

Answer 2

The plants which produce their own food is called autotrophs.

Micro-organisms which breaks down the dead remains of animals and plants are called decomposers.

sorry I don't know what are heterotrophs.