Gas makes up our atmosphere but can be used by plants only when transformed by bacteria first

Describe the relationship between photosynthesis and cellular respiration

Nitrogen-fixing bacteria convert atmospheric nitrogen into

The highest organism on the food chain

If an insect eats a plant and a bird eats the insect, about how much energy from the plant is stored in the insect for the bird to use?

Growth of plants after a forest fire is an example of

Most of the Earth's carbon is secured in

Excessive algae growth in freshwater ecosystems is a direct result of

Which organisms are most likely to arise in areas experiencing primary succession?

The process of breaking down food to yield energy is called

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