Which of the following energy transformations occur when humans use energy from food to exercise? A. Mechanical - thermal - chemical
B. Thermal - electrical - mechanical C. Radiant - mechanical - thermal
D. Chemical - mechanical - thermal​

D. Chemical - mechanical - thermal

Explanation:

D because the food is chemical and the mechanical is the human excersice, and it results in thermal

D. Chemical - mechanical - thermal​

Explanation:

Food contains chemical energy; when our bodies break down and digest food, the bonds that are broken apart release chemical energy. Our bodies convert this to mechanical energy to power movement, from movements as small as blinking or our hearts beating, to bigger movements like running or swimming. When we exercise or move, we also release heat which is thermal energy.