Each species depended on the other, and furthermore, it was the oil that made it possible.

Many species depend intimately on other species for their survival.

The other species it is found with depends on factors such as the soil, altitude, and degree of slope.

He is the ultimate feedback upon which our species depends.

Some species actually depend on fire to clear out competitors or to germinate their seeds.

In this ant-fungus mutualism, both species depend on each other for survival.

When resources are limited, several species may depend on these resources.

The largest species depends upon the true taxonomy of the family.

Different species depend upon particular habitats, and resources, food, etc.