Answer:
the answer would be D. synaptic peptide. The synapse, the firing of an action potential in one neuron—the presynaptic, or sending, neuron—causes the transmission of a signal.
Explanation:
Answer: x=2. y=0
Explanation: if 2x=4 then x is 2 so if you substitute 2 into th formula you would have 2(2)-4=8y
4-4=8y
0/8=8y
0=y