Cellular respiration is the process by which organisms use oxygen to break down food molecules to get *chemical energy *for cell functions.
Photosynthesis<span> is plants taking in water, carbon dioxide, and light to make sugar and oxygen. This is </span>important<span> because all living things need oxygen to survive. All producers make oxygen and sugar for the secondary consumers and then the carnivores eat animals that eat the plants.
Hope this helps</span>
Scientists classify rocks based on texture, composition, and how the rocks formed.] Rocks are classified by how they formed.
