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Food Chains : What is a food chain. What do the arrows indicate and why they do they point in a certain way? Why is a food chain limited and why does it not display all the relationships an organism has with other organisms?

Food Webs: What is a food web? What are the various roles organisms take within a food web (i.e.; producer, first-level, second-level, and third-level consumers)? How can an organism can be a consumer at various levels?

The Delicate Balance of Organisms: What can happen to a food chain and a food web if the population of a certain species changes. How does this change relate this to the destruction of organism habitats as parts of the Amazon are damaged.