Sometimes genes, for no known reason(s), change their form in a process called spontaneous

Sometimes genes change their form in a process without a reason and it's called spontaneous mutation. Spontaneous mutations occur with non-zero probability. And they occur even in an uncontaminated cell. They are characterized by the specific changes.

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.

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