Biology

The correct answer is: D.oxygen, carbon dioxide.

Here’s why:

Respiration is the process by which animals (and plants) take in oxygen (O₂) from the environment and use it to break down food molecules (like glucose) to release energy. During this process, carbon dioxide (CO₂) is produced as a waste product and is released back into the environment.

So, animals take in oxygen and release carbon dioxide as a result of cellular respiration.

Let’s go through the other options:

A.Photosynthesis, air: This is incorrect. Photosynthesis is a proce...