Which type of consumers is the most stable in an ever changing environment?

vegetarians
herbivores
carnivores
omnivores

Omnivore is the type of consumers is the most stable in an ever changing environment.
Omnivore are organisms that eats both plants and meat. Thus, either ways they can live with the absence of meat nor plants. 

Omnivores because they can eat vegetation and meat.

Cand d are correct because the rest are just showing your mistakes and you don’t want people who are reading a summary you wrote to see all the mistakes you made.

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