Here is the answer for the last question.
H
ope I helped.
It is b because of all the cells that produce the chemical bond
Mutualism is the relationship where both organisms benefit from each other in some way
The up and down arrows you carved into the spinal cord are meant to represent the movement of different nerve signals. These signals, which are slso called action potential, are coordinated movements of sodium and potassium ions that are psocessed across the nerve cell membranes