AP BIOLOGY

Detailed explanation-1: -Oxygen is released by plants during the process of photosynthesis. And oxygen is used by animals or humans for survival so we can say that Oxygen gas is produced by plants and used by animals.

Detailed explanation-2: -Plants and animals use oxygen to respire and return it to the air and water as carbon dioxide (CO2). CO2 is then taken up by algae and terrestrial green plants and converted into carbohydrates during the process of photosynthesis, oxygen being a by-product.

Detailed explanation-3: -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-4: -We humans, along with many other creatures, need oxygen in the air we breathe to stay alive. Oxygen is generated during photosynthesis by plants and many types of microbes. Plants both use oxygen (during respiration) and produce it (via photosynthesis).

Detailed explanation-5: -Every animal needs oxygen1. Oxygen is used in certain cell parts to change the food molecules in our cells into energy they can use. Without that energy, our cells (and we) would die. Our cells also make waste products as they work.