How does secondary succession differ from primary succession gradpoint?

Secondary succession is when a forest fire or when people chop down trees, the ecosystem still has plants there and it regrows itself.

Primary succession is when a volcano erupts of a glacier wipes out all the snow and lichen (pioneer species) grows. 

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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