the answer is B cholesterol, which is a direct product of the steroid nucleus.
The pulmonary structures refers to the organs of the body that are involved in the breathing process. These include the nostril, the oral cavity, the trachea, the two lungs, etc. Humans take oxygen from the environment to facilitate the respiratory process, at the same time they release carbon dioxide to the environment using the pulmonary structures.
Answer:
A.
Explanation:
Bc the rest are not reasonable
In the second cycle of what?
