Cells are the message carries for the animal.

1.muscle
2.white blood
3.nerve
4.bone
5.red blood

I believe it is Nerve Cells

Correct me if I'm wrong.

Nerve cells are the message carries for the animal.

the way that the mass of carbon can be conserved through cellular respiration is through a process/law called the law of conservation of mass which even tho it undergoes a process, mass is not be destroyed or changed

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.