Of the thorns or spines and the greeny pigmented hard part of the cactus are the leaves and why?​

The spines of a cactus are exactly not the leaves, but they are the solid hard part that reduces the rate of transpiration, so as to level the water constant in the cactus' body. They are important as it can reduce the animals from eating the cactus.

However, camels have thick jaws and can eat cactus easily .

Hope it helps you...

(Answered by Benjemin)

human didn't come from monkeys man i hate these stupid teachers