Glucose that circulates in the bloodstream is kept within a normal range by
O being used up for energy or being stored in
the form of glycogen.
the hypothalamus raising or lowering internal
body temperature.
a positive feedback mechanism controlled by
the hormone insulin.
o the enlarging of blood vessels when body
temperature goes beyond the set point.

A. being used up for energy or being stored in the form of glycogen.

Explanation:

Edge 2020

exposure to hazardous carcinogens and toxic substances can cause breathing problems, such as copd and various types of cancer. it also increases the risk of heart attacks and strokes and has serious (but no less unattractive) side effects, such as aging, yellow teeth, a terrible smell and damage to the vocal cords.