Most organisms break down sugar to produce usable energy through the process of
a)
diffusion.
b)
chemosynthesis.
c)
photosynthesis.
d)
cellular respiration.

D) Cellular Respiration

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.

Iwould say overuse ( but not 100% sure ) in the u.s. we tend to overuse water by leaving it running, throwing it away, taking long showers, etc.