Question

choose the correct answer. why do we breathe in oxygen and exhale carbon dioxide? both gases are produced during cellular respiration. oxygen is a product of cellular respiration. oxygen is required to start cellular respiration, and carbon dioxide is a product.

Explanation:

Cellular respiration is a process that uses oxygen to break - down glucose and produces carbon dioxide as a by - product. Oxygen is needed to initiate the process, not produced by it.

Answer:

Oxygen is required to start cellular respiration, and carbon dioxide is a product.