Answer:
Label A is the amino group
Label B is the R group
Label C is the carboxyl group
Explanation:
There are 3 major parts of the respiratory system: the airway, the lungs, and the muscles of respiration. The airway, which includes the nose, mouth, pharynx, larynx, trachea, bronchi, and bronchioles, carries air between the lungs and the body's exterior.
it led to a study of how to induce cancer cells to divide more rapidly