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Algae are plantlike organisms that live in the water. These algae have been in sunlight for several hours now. What can the algae do because they are in sunlight?

The algae can take in carbon from the air. The carbon is used to make energy storage molecules. This process is called photosynthesis and requires energy from sunlight.

Dugongs are animals that live in the ocean and eat underwater grasses. The sun is shining on the shallow ocean water where the grasses and dugongs live. What is happening to the carbon in the water around the grasses and dugongs?

Carbon is moving into the water and out of the water, at the same time. Grasses do photosynthesis which moves carbon out of the water. Both Dugongs and grasses do cellular respiration which moves carbon into the water.

A scientist built a model ecosystem that contains air, plants, and animals that eat those plants. It is sealed so no material can get in or out, but the glass sides allow light to get in. The model ecosystem can also be covered to prevent light from entering. The amount of carbon in the air inside the model ecosystem started out high. Now the amount of carbon in the air is decreasing. Is the model ecosystem now in sunlight or is it covered?

The model ecosystem is in sunlight, and there are more energy storage molecules in the plants and animals. We know that there is more carbon in the form of energy storage molecules because there is less in the air. Plants are doing photosynthesis which requires sunlight and turns carbon in air (carbon dioxide) into energy storage molecules.

What does this picture represent?

Using energy from sunlight, carbon dioxide and water react to form glucose (an energy storage molecule) and oxygen. During this reaction, atoms are rearranged.

What does this picture represent?

What does this picture represent?