How is oxygen used by living things and in other important processes?

The kind of fertilization found in the majority of aquatic animals is (internal or external) fertilization.

The pharynx is the structure in the body that serves as a pathway of both air and food. how does the body make sure that food does not get into the lungs? the salivary glands secrete enzymes that pull food out of the air pathway. the small intestine pushes the air out of the digestive system. the pancreas breaks down food in the air pathway. the epiglottis closes the air pathway so that food will not enter it.

Long-period comets come from the oort cloud particles in earth’s atmosphere material from the asteroid belt the kuiper belt