3. Occasional droughts led to indigenous people fighting
over resources in:

Need more info can’t really get an answer out of this sorry :/

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.