Explain the main characteristics of the age pyramids of developed countries?
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Define a biome?
Can a tertiary consumer of one chain be a primary or secondary consumer of another chain?
What is the difference between primary ecological succession and secondary ecological succession?
Why is leguminous crop rotation used in agriculture?
What are primary consumers? Can food chain present quaternary consumers without having secondary or tertiary consumers? Can a tertiary consumer of one chain be a primary or secondary consumer of another chain?
Explain why transgenics are considered a threat to the environmental safety?
Define nuclear pollution?
How many tropic levels can a food chain have?
Under which form is nitrogen fixed by the living beings.
What are primary consumers? Can a tertiary consumer of one chain be a primary or secondary consumer of another chain?
What is the difference between the concepts of community and population?
Explain different types of wastes?