Herbivores eat plants, which form the foundation of the food chain but are the toughest to digest.
(Herbivores; eat; plants, which form the foundation of the food chain but are the toughest) (plants; form; the foundation of the food chain) (plants; are; the toughest to digest) (the toughest; to digest; )
Herbivores plants plants the toughest
eat form are to digest
plants, which form the foundation of the food chain but are the toughest
the foundation of the food chain
the toughest to digest