Hormones are chemical messengers that are secreted directly into the blood, and then carries them to organs and tissues of the body to exert their functions. hormones are secreted from the endocrine glands in the body.
   advantages of homones theraphy
1. decrease tooth lost
2. lower risk of colon cancer
3. modest improvement in joint pains
4. lower risk of diabetes
5. lower death rate for women who take homones theraphy in their 50s.

 is science variation means a marked difference or deviation from the normal or recognize
form, function or structure. it can also refer to an organism  or plant exhibiting such difference or deviation.

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