Under which form is nitrogen fixed by the living beings.
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What are persistent organic pollutants?
What is the formula of the net primary production (NPP)? How does NPP relate to the energy pyramids?
Define dry mass?
What are pioneer species?
What is ecological succession?
What are primary consumers?
Define biotic potential?
Is pollution always caused by humans?
Define protocooperation?
Define a food chain?
Define carbon cycle?
Which is the autotrophic group responsible for the production of most part of the molecular oxygen of earth?