The correct answer that would best complete the given statement above would be the first option. Coral reefs are built by a small organism called a polyp. The polyp creates the structure of the coral reef by building a CUP out of a calcium carbonate. The skeletons of these tiny corals s<span>ecreted by the lower portion of the polyp. Hope this answer helps.</span>
carbon, hydrogen<span>, </span>oxygen<span>, </span><span>nitrogen</span>
The general theory is that mitochondria and chloroplasts began initially as separate cells that were "eaten" by larger cells, but not digested and simply passed on due to their advantages.<span />
Answer:
Your body uses oxygen to get energy out of the food you eat.
Explanation:
Oygen breaks down sugar in cellular respiration
