Respuesta :

Answer:

Plants and decoposers

Explanation:

Plants are vital organism because creates

photosynthesis to make sugar ( they can make

their own food ) and the start of the food chain.

Decomposers are vital organism since they break down dead plants and animals ( think as Earth's recyclers ).
Primary consumers, mostly herbivores, exist at the next level, and secondary and tertiary consumers, omnivores and carnivores, follow.