What is the respective importance of carbon for the living beings?
What is ecological succession?
What is the water cycle?
What is a population?
Define protocooperation?
What are the main sources of mercury pollution?
Explain nitrogen cycle?
What are the main factors that affect the growth of a population?
How does gpp relate to photosynthesis?
What is the typical conformation of the age pyramids of underdeveloped countries?
What do energy pyramids represent?
Define biosphere?
Define biologic control?
What is the most abundant form under which nitrogen is found in nature?
What are the destinations of the organic material fabricated by the producers?