The electrical component of neurotransmission is produced by: 1)Sodium and potassium
2)Rest and digest
3)Fight or flight
4)Dopamine and serotonin

Answer (b) supersaturation;

Answer is: the equilibrium  shifts toward the reactants, to the left side of chemical reaction.it is because lead(ii) nitrate dissociates in water: pb(no₃)₂ → pb²⁺(aq) + 2no₃⁻(aq).according to lechatelier's principle, the position of equilibrium moves to counteract thechange (more lead cations, common ion), the position of equilibrium will move so that the concentration ofproducts decrease and concentration of reactants of chemical reaction increase.read more on -

The disturbance is only parallel to the motion of the wave.