Question

why do herbivores have longer number than small than carnivores

Answer 1

They mainly take of cellulose
which is a complex sugar
so it needs a longer path for digestion
that's why herbivores have longer small intestine than Carnivores.

Answer 2

Herbivorous animals have longer intestines than that of carnivorous animals. This is because their diet is grass and plants, made up of fibre and cellulose which are hard to digest. As a result the herbivorous animals need a longer digestive track to digest their foods completely.  A longer intestine would also host many small bacteria that process and break down cellulose into glucose, a source of energy which the host herbivore can use. Without the long intestines, animals such as cows could still eat grass, but would not be able to use the glucose stored in the grass structure.

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