E.g. flowers and pollinating insects. Some organisms cannot live alone: lichens (fungus [protection] and alga [food]) Symbiosis: "living together" (harmful or beneficial; parasitic or mutualistic) Even predator-prey relationships, mutual advantages exist. Killing of individual prey that are weak or diseased may benefit the population as a whole by keeping it healthy...
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Killing of individual prey that are weak or diseased may benefit the population as a whole by keeping it healthy. Predators and parasites may also prevent herbivore populations from becoming so abundant that they overgraze their environment (which might jeopardize the entire ecosystem). --what about humans? Hitler...
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The Nitrogen Cycle Plants then take up nitrate and ammonium, get lost in the subsoil or atmosphere, or are changed in the soil. The last form of nitrogen fixation is Biological Fixation...	2 / 437
Nitrogen Cycle Ammonia can be used directly as fertilizer, but most of its is further processed to urea and ammonium nitrate (NH4NO3). Biological Fixation The ability to fix nitrogen is found only in certain bacteria and archaea...	3 / 785
Nitrogen Cycle This process reduces nitrate back into the amino group (ammonium). This allows the plant to absorb the ammonium ions. This is also a two step process. The first step takes place in the cytosol called nitrate reductase...	2 / 445
Nitrogen The next step is nitrogen reduction. This process reduces nitrate back into the amino group (ammonium). This allows the plant to absorb the ammonium ions...	2 / 444