Some organisms mutate and genetically different. Natural selection is when things die off because they have not mutated or adapted to the environmental changes(survival of the fittest) adaptation is necessary to overcome environmental changes. Sorry if I didn't explain this good enough but I hope I helped some
A. flies
flies are usually attracted to rotten odor smells, and so they would fly to the area. On contact with the flower, the pollen will get on the fly. After flying away, some of the pollen would fall to the ground, resulting in another flower blooming if conditions are right
hope this helps
Organisms must reproduce C. to continue the species.
If organisms don't procreate, it means that their species will disappear. So in order to prevent the disappearance of a species, organisms mate to produce new organisms.