The lake is presently healthy and has a balanced aquatic ecosystem.

In order for a functioning and balanced ecosystem to exist, there must be carnivores that prey on the herbivores.

This approach was an attempt to mimic a balanced ecosystem in nature.

These wildflowers or indigenous plants fill the goals of those who want to maintain a balanced ecosystem and duplicate nature as best they can.

Every cave had its own balanced ecosystem.

It also seeks new knowledge and/or alternative for the maintenance of a balanced ecosystem.

Park officials manage populations of bison, horses, and elk to maintain a balanced ecosystem.

Yet another reason it's important to maintain a balanced ecosystem.

Maybe we should take the opportunity to start a balanced ecosystem here,?

The ideal pond is a balanced ecosystem of fish and plants.