Answer :
When there is the right amount of things like right and good amount of preys or predator or air etc.
Answer and explanation;
An ecosystem is said to be balanced when gases are in their correct proportions, when There is enough preys for the amount of predators and generally there should be fewer large organisms than there are small ones.
In other words an Ecosystem is balanced when the natural animals and plants together with non livings things are in harmony; meaning the abiotic and biotic factors in the ecosystem are in harmony.
All species are important and help keep the ecosystem balanced.
