What is the nitrogen cycle?
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What is plankton?
What are the destinations of the organic material fabricated by the producers?
What are the phytoplankton and the zooplankton?
Explain the typical conformation of the age pyramids of underdeveloped countries?
Give an account of the classification of ecology?
What are biotic factors?
Define a food chain?
How is carbon dioxide made by producers and consumers?
In a numeric pyramid to which tropic level does the base always refer?
Explain water cycle?
Which harms can thermal inversion cause to humans?
What are some examples of interspecif competition?