Question

Animals breathe, oxygen and give out carbon dioxide.

• A. True
• B. False

Answer 1

The correct option is A True

All animals, including humans, require oxygen to survive. Animals breathe in the oxygen made by plants and breathe out carbon dioxide as a waste product. Even animals that live underwater need oxygen. These animals pass water over their gills to take in dissolved oxygen that is made by water plants. The water plants in turn take in the dissolved carbon dioxide from the water.

Animals and plants are connected to each other by the oxygen-carbon dioxide cycle. Plants need the carbon dioxide from animals to live and animals must have the oxygen from plants to survive.