Stem cells could be immensely important in the treatment of conditions

Spinal injury conditions.

Explanation:

Stem cells can be defined as the those cells of the body which has the ability to differentiate in many types of the body cells. These cells are pleuripotent in nature.

These cells can used in treating many diseases in which the cells lose the ability to grow further. Those cells can be replaced by the stem cells and normal growth can be observed.

The disease such as Alzeheimer's and  Parkinsons's can be treated by replacing the damaged neurons by the stem cells.

since you have not provided the options here i   am going to give you general overview about hormone.hormone are actually the part of endocrine system in our body and produced by the endocrine glands. the hormones act like a chemical messenger   within human body. once produce by the glands they   travel through the blood stream and reach at specific or target tissue and organs   which result in control of our body function. the hormones are specific in their work and work on only the targeted tissue or organ   . with the of hormone endocrine system regulate the heart rate , metabolism, our mood and   growth as well as the development and even the sleeping cycle etc. they actually are the messenger for body cell and organs .