Which treatment is chemical and uses disinfecting agents to clean the
water?
O primary
O secondary
O tertiary

The answer is a i believe

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.

Enzyme. anything that ends in "ase" is usually an enzyme.