List and compare the levels of organization within ecosystems

The levels of organization in an ecosystem are:

Species - a group of genetically related individuals that can breed to produce fertile young. The individuals are not necessarily members of the same species. 

Population - a group of same species that interact with one another and reside in the same location.

Community - a population comprised of different species that interact with one another and reside in the same location.

Ecosystem - includes all non-living aspects and the living population of the environment. It comprise both abiotic and biotic factors in the area. 

They would soon die if you remove the food source keeping them alive, but if you add another apple it would make the fruit flies thrive again if not create more population