What is the phytoplankton?
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Define an ecosystem?
Define biologic control?
Define parasitism?
Define dry mass?
Explain why transgenics are considered a threat to the environmental safety?
Explain the mutualism?
Into which type of energy is the light used in photosynthesis transformed.
Explain the main means by which autotrophic beings obtain energy?
In a numeric pyramid to which tropic level does the base always refer?
Define species?
Which is the autotrophic group responsible for the production of most part of the molecular oxygen of earth?
What is the cost-benefit relation regarding sewage treatment as a strategy to fight water pollution?