What are species?
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What are the typical vegetation and the typical fauna of the taigas?
What is the water cycle?
What is the phytoplankton?
What is the formula of the net primary production?
How does net primary production relate to the energy pyramids?
What is Ecology?
How the biotic potential can be represented in the same graphic?
What is protocooperation?
Define pollution?
What is age pyramid?
Define protocooperation?
What are the main sources of mercury pollution?