Grass is much harder to digest, release the nutrients from. Plant-eating animals usually have either more powerful grinding teeth, longer gut, more stomachs(like cows), or chew their cud, or a combination of these in order to get nutrients out of Grass.
Yes, of course, cows and sheep use them as their main nourishment. We humans, however, can't use grass as food.
Red algae is a source of food and food additives for humans.
it is a food source for an animal that is a food source for humans
Grass
corn potatoes and fish
it eats grass or humans give it to them
Foxes really are not a food source for humans.
Red algae are a source of food and food additives for humans.
grass and leaves from trees and bushes
Tree bark, leaves and grass
Not for humans
Well humans don't eat grass because it just isn't on the food pyramid or anything plus cows and horses eat grass. Plus grass is in the ground and the ground is not clean.