How are grasslands classified?
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What is the respective importance of water, carbon, and nitrogen for the living beings?
What is the cost-benefit relation regarding sewage treatment as a strategy to fight water pollution?
What is the formula of the net primary production (npp)?
What is plutonium reprocessing? Why is it a big environmental issue?
What is a food chain?
What is the carbon cycle?
Can the amount of available energy in a given tropic level to be larger than the available energy in inferior tropic levels? What does that condition means to the conformation of the energy pyramids?
Define protocooperation?
What are tropic levels? How many tropic levels can a food chain have?
Define an ecosystem?
Define population?
What is biosphere?