How does the vegetal stratification of an ecosystem influence the biological diversity?
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Define pollution?
What is numeric pyramid? What does it represent?
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?
What is harmonious ecological interaction?
Explain the role of the ozone layer for the living beings?
What is inharmonious ecological interaction?
What are societies?
Why is leguminous crop rotation used in agriculture?
what is transgenic food and its health hazards?
Explain the primary energy source for life on earth?
Explain global warming?
What is a population?