AP BIOLOGY

Detailed explanation-1: -Plants are autotrophs, which means they produce their own food. They use the process of photosynthesis to transform water, sunlight, and carbon dioxide into oxygen, and simple sugars that the plant uses as fuel.

Detailed explanation-2: -Oxygen is given off by green plants in the process of photosynthesis. Green plants are the lungs of the earth! All animals inhale oxygen and exhale carbon dioxide. Plants take in carbon dioxide and give off oxygen as they make food.

Detailed explanation-3: -Algae, along with plants and some bacteria and fungi, are autotrophs. Autotrophs are the producers in the food chain, meaning they create their own nutrients and energy.

Detailed explanation-4: -During cellular respiration animal cells combine oxygen with food molecules to release energy to live and function. Remember that cellular respiration produces carbon dioxide as a waste product. Animals use energy to grow, reproduce, and to function.

Detailed explanation-5: -Photosynthesis: The oxygen is returned to the atmosphere through photosynthesis by plants. During photosynthesis, the carbon dioxide, and water are used by plants to form food along with the release of oxygen. The process of fixing atmospheric carbon by trapping the sun’s energy in biological form.