I think the main difference is that the id means primal impulses, but superego means primal impulses and self control together.
According to the Red Cross, people who have tattoos can donate blood. It's just that they would have to wait for 5 or 6 months after getting a tattoo before donating their blood. Same thing if you get your ears pierced.
Answer:
A buffer
Explanation:
A buffer is composed of a weak acid and a conjugate base. They are resistant to pH because of equilibrium between the acid and its conjugate base.
