Suppose the number of organisms in one population in a community suddenly increases. predict what might happen, and explain why.

The organisms in that community would overthrow a smaller group of organisms on which they had been preying on. So there would be a overbalanced population of predators and less prey.

There are many things can happen.
One: the species of increase here could die due to space, resources, and pray.
Two: of the species is a pray the predator species will increase in number.
Three: if the species, like humans are not prey. They may begin to find ways to live in other ways hence, natural selection. They may become cannibals

The answer is ozone layer.