What is the most abundant form of nitrogen in nature?
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Define transgenic food?
Explain water cycle?
What is a community?
What are the main types of waste?
In a numeric pyramid, is it possible the base to be smaller than the other levels?
Explain what are the main limiting factors for the growth of a population?
What are the main limiting factors for the growth of a population?
What is an ecosystem?
Explain the parasitism?
Which is the autotrophic group responsible for the production of most part of the molecular oxygen of earth?
What are the typical vegetation and the typical fauna of the tropical forests?
What is a biome?