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?
402Can the amount of available energy in a given tropic level to be larger than the available energy in inferior tropic levels? What does that condition means to the conformation of the energy pyramids?
412
How are the grasslands of North America and of South America respectively called?
What are the typical vegetation and the typical fauna of the deserts?
Define a food chain?
Define selective waste collection?
What are the typical vegetation and the typical fauna of the temperate forests?
What is the typical vegetation of the grasslands?
What are some examples of interspecif competition?
What is a community? What is the difference between the concepts of community and population?
What are persistent organic pollutants (POPs?
What is inharmonious ecological interaction?
What is the cost-benefit relation regarding sewage treatment as a strategy to fight water pollution?
Explain remediation?
Explain how can the abundance and diversity of living beings in the tropical forests be explained?
Explain some examples of interspecif competition?
Explain what is the most abundant form under which nitrogen is found in nature?