What are tropic levels? How many tropic levels can a food chain have?
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Under which form is nitrogen fixed by the living beings.
Explain the main characteristics of the age pyramids of developed countries?
How can a great biological diversity protect an ecosystem from environmental damages? Why are less biodiverse ecosystems under the risk of suffering deep biological harms if submitted to even small changes?
Besides mercury which other heavy metals cause toxic pollution?
Define protocooperation?
What is the most abundant form of nitrogen in nature?
Explain what are fossil fuels?
What is the carbon cycle?
Explain the main causes of the loss of the biological diversity nowadays?
In a numeric pyramid to which tropic level does the base always refer?
Explain different types of wastes?
Which type of energy is the light used in photosynthesis transformed.