Answer:
thank for the points lovely
Because to actually use the word evolve an organism must suffice more than one condition, which in this case would be an advantageous trait. Having an advantageous trait (from our eyes at least) must also include the right and stimulating enviironment for procreation. So this answer is multifolded.
The vegetation in most environments is crucial as a food source for many animals in the area. Without it, many animals may starve, thus setting on a chain reaction of animal displacement.
Answer:
because the want to reach their destination