According to the second law of thermodynamics, energy is never 100% efficient because some of the energy disperses as heat.
D) Pituitary
The reason for the answer being choice D is because the pituitary gland is a small pea-sized body attached to the base of the brain. The pituitary gland is important in controlling growth and development and the functioning of the other endocrine glands.
The answer is alveoli, there the only structures.
Hope this helps! Have a BLESSED day! :-)
