How do the muscles help in thermoregulation? Muscles produce oil that burns in the presence of oxygen.
O Muscles undergo a chemical reaction that absorbs heat.
Muscles break down carbon dioxide, producing heat.
Muscles contract rapidly, producing heat.

The answer is d i think

A  reaction  in which  energy  is  released  to the surroundings is called an exothermic  reaction. in this type of  reaction  the enthalpy, or stored  chemical energy, is lower for the products than the reactants. when ammonium nitrate is dissolved in water,  energyis  absorbed  and the water cools.