Organisms competing for the same food source in an ecosystem can coexist through various mechanisms, such as niche differentiation, resource partitioning, and behavioral adaptations. Or they could just ignore each other completely.

Rewrite this in a 7th graders words

Animals that eat the same kind of food in an ecosystem can live together by finding different ways to survive. They might split up the food they eat, change their behaviors, or just avoid each other completely.