Define a population?
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How do populations of predators and preys vary in predatism?
What is the respective importance of water, carbon, and nitrogen for the living beings?
What is the gross primary production of an ecosystem?
What is the typical conformation of the age pyramids of underdeveloped countries?
What are primary consumers? Can food chain present quaternary consumers without having secondary or tertiary consumers? Can a tertiary consumer of one chain be a primary or secondary consumer of another chain?
What are plankton, nekton, and benthos?
Explain how are the grasslands of north america and of south america respectively called?
What is mutualism?
What is the most abundant form of nitrogen in nature?
What are the main intraspecific ecological interactions?
What are biomass pyramids?
Define harmonious ecological interaction?