Because Earth is a closed systems ne energy from the sun enters,
no matter enters or leaves, except sunlight
energy from the sun enters, but is reflected back into space,
changes to one area do not affect any other areas,

Is this a question? i'm confused

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.