<span>Carbon is present in the biosphere and other systems of the planet and is an essential part of life. Carbon moves through these systems by feeding the heterotrophs of other organisms, through the consumption of dead organisms. When oxygen is present, there is aerobic respiration, which releases carbon dioxide into the surrounding air or water. It plays an important role in the structure, biochemistry, and nutrition of all living cells.</span>
I think the answer is spongocoel
Tell me if I'm correct or incorrect:)
Chemical digestion of carbohydrates, proteins, lipids, and nucleic acids. The chemical breakdown of the macromolecules that is contained in food is completed by tons and tons of enzymes that are created in the digestive system!
Skeletal muscle is made up of voluntary muscles but can contract involuntarily<span> by reflexes. </span>
