When does the metabolic rate increase?
a. when muscle mass increases
b. when fat mass increases
c. when fat mass decreases
d. when muscle mass decreases

a. when muscle mass increases

Explanation:according to health expert muscles increase will increase the rate at which your body burns calories even when you are at rest, your body continues to burn calories which increase the metabolism rate.

The ability of your body to digest food increases with muscle increase.

halogen, any of the six nonmetallic elements that constitute group 17 (group viia) of the periodic table. the halogen elements are fluorine (f), chlorine (cl), bromine (br), iodine (i), astatine (at), and tennessine (ts).