Why is physical activity so important in preventing heart disease?

In summing we use which law of motion

Choose thyroid, parathyroid, or the adrenal gland and choose one disease affecting this part of the en-docrine system.

*edit* i took the test and i picked a and it was incorrect for its c! rank the following suggestions for preventing std, in order of increasing effectiveness. 1) using latex condoms properly 2) using spermicidal foam or jelly with a monogamous partner 3) abstaining from sexual intercourse and genital contact a. 1, 2, 3c. 2, 1, 3