Explain water cycle?
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Explain what are fossil fuels?
Under which form is nitrogen fixed by the living beings.
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?
Why is the sun the “motor” of the water cycle?
Explain the main biological process that consumes carbon dioxide?
Which harms can thermal inversion cause to humans?
What is a food chain?
What is population?
Define nuclear pollution?
Why is cannibalism an inharmonious intraspecific ecological interaction?
what are the difference between migration, emigration, and immigration?
What is numeric pyramid?