Other organisms, like animals, depend solely on organic nitrogen from their food.

But the lack of evidence does not exclude plague because the ability to culture the organism depends on doing the requisite bacteriological tests.

Many organisms in the ocean depend on the proper concentration of ions in sea water to live.

Dams disrupt temperature and nutrient patterns on which organisms depend.

It also includes the habitats these organisms depend on.

The problem is that various marine organisms depend on the cordgrass near the shore for shelter and sustenance.

All animals and plants and most other living organisms ultimately depend on the products of photosynthesis for survival.

If other organisms in the ecosystem also depend upon these plants as food resources, then these species may go extinct as well.

They maintain the soil structure and fertility on which plant growth and thus all higher organisms depend.

Without them, many of the ecological processes upon which we and other organisms knowingly or unknowingly depend, would soon grind to a halt.