When a fossil fuel is burned, energy is converted to kinetic energy.

I looked it up-Second Law: The amount of usable energy in the universe is steadily decreasing, while the level of disorganization is steadily increasing. ... in all natural processes some potential energy (organized energy) is always converted to kinetic energy (disorganized energy, usually in the form of heat). So your answer should be usable energy

Neurotransmitters are messengers responsible for communication between neurons. they are released from synaptic vesicles and are received by receptors.  the communication is referred to as neurotransmission. the following statement is true about neurotransmitters: a. they're stored in synaptic vesicles in the axon.