The two phenomena that explain the experience curve are

The two phenomena that help explain the experience curve are learning effects andeconomies of scale. Learning effects refer to cost savings that come from learningby doing. Economies of scale refer to the reductions in unit cost achieved by producing a large volume of a product.                    
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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.