Awell supported testable explanation of phenomena that have occurred in the natural world is called

For the answer to the question above, the answer is simply a "Scientific Theory"
it is a well-substantiated and well-presented explanation of the natural world, it is based on repeatedly confirmed through observation and experiment of the said phenomena. These are not the wild guess but reliable facts of the real world events.

The correct answer is c

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.