Question

which does body mass index (bmi) measure?
total amount of body fat per body mass
height to weight ratio of an individual
risk of chronic disease
level of physical activity

Explanation:

Body mass index (BMI) is calculated using the formula \(BMI=\frac{weight\ (kg)}{height\ (m)^2}\). This formula clearly shows that it is based on the relationship between a person's weight and height. It is not a direct measure of body fat percentage (as there are other methods like skin - fold calipers for that), not a direct measure of chronic disease risk (though it is used as an indicator in some cases), and not related to physical activity level.

Answer:

height to weight ratio of an individual