what are the difference between migration, emigration, and immigration?
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Define population density?
Explain remediation?
What are the analyses provided by the study of human age pyramids?
How is carbon dioxide made by producers and consumers?
What is the main means by which autotrophic beings obtain energy?
How many tropic levels can a food chain have?
Is pollution always caused by humans?
What is biosphere?
What is benthos?
Can a tertiary consumer of one chain be a primary or secondary consumer of another chain?
What do biomass pyramids represent?
What are the main types of waste?