How has coevolution of plants and insects increased the amount of insect species.?
Speciation can occur in a number of ways. In this particular case, certain populations of insects frequented a certain species of flowering pland until there was no longer a need for the ability to visit other plants. After the need for structures that made visiting other plants possibe was removed, mutants that lacked these structures were better able to make use of their energy, had more success mating, and their traits became common in the species. This phenomenon is seen in cave creatures that have lost their eyes (as need for such structures is vastly reduced in lightless caves). It is also possible that different populations visited different plants, and over time the drift of genetic material made any breeding between the different populations sterile or fragile. A commonly used example of this phenomenon is the squirrel populations around the grand canyon, all of which were once the same species, but which were separated from each other and are now genetically distinct. And it