Where does all energy for most organisms on earth come from?
a. oxygen
b. carbon dioxide
c. water
d. sunlight?

D. We are mostly depending on sunlight for energy.

Ichoose a as my answer

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.