What is an invasive species? * A species that is found in an ecosystem.
A species that once was in an ecosystem.
A species that has different niches in the same habitat.
O A species that is introduced to an area.

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.