Below are a few major topics for this chapter, listed in random order.

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• CFCs and the ozone layer. Hint
• Net primary production. Hint
• Secondary production. Hint
• Carbon cycle. Hint
• Water cycle. Hint
• Nutrient cycling. Hint
• Nitrogen cycle. Hint
• Pyramid of net production. Hint
• Pyramid of biomass. Hint
• Global warming. Hint
• Energy flow. Hint
• Eutrophication. Hint
• Ozone depletion. Hint
• Biological magnification. Hint
• Phosphorus Cycle. Hint

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Note: this is not a complete list of topics from which test questions will be drawn.