Nurses
Nurses are professionals that are trained to provide care for individuals, families, and communities with diseases, illnesses and injuries. Nurses usually accompany and assist physicians. Physicians depend on good nursing to ensure that patients are given the best care. Nurses make a physician’s job easier and they carry out specific services ordered by the physician. Duties of nurses include; educating patients, administration/prescription of medicines to patients and monitoring of patient’s health.
Rat incisors continue to grow, while ours do not.
The answer is "D. Adaptation"