1. Circulatory system = the parts of the body that are related to the movement of blood
2. Internal system = the organs inside the body and how they function together
3. Muscular System = the part of the body that is made up of the muscles
4. Skeletal system = The bones found in the body
Answer:
47%
Explanation:
Among all respondents who developed alcoholism at some point, almost half (47 percent) met the diagnostic criteria for alcohol dependence (alcoholism) by age 21.