No, we cannot survive only on raw, leafy vegetables/ grass.
Explanation
Humans cannot survive only on raw, leafy vegetables, or grass. It is because the grass is rich in cellulose, which is a type of carbohydrate that humans are not able to digest due to the absence of cellulose-digesting enzymes. Also, our body requires all kinds of nutrients like protein, vitamins, minerals and fats. So human cannot survive only on raw, leafy vegetables.
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