What two processes work to maintain stable levels of oxygen and carbon dioxide in the atmosphere?

Arrows within a food chain or food web represent

What type of organisms recycle materials by the breakdown of organic molecules from dead organisms?

What type of organism is at the beginning of a food chain?

What type of organism should all food chains end with?

Approximately what percentage of energy is transferred from one level of a food chain to the next?

What shape is used to represent the amount of energy available or the number of individuals that exist at each level of a food chain?

What type of organisms would be affected if the number of herbivores in a food chain were decreased?

In what type of symbiotic relationship is one organism harmed while the other organism benefits?

What term describes the number of different types of organisms that live in a particular area is?

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