Either mechanical or physical. I would say physical though.
Answer:
D) Majority; unvaccinated
Explanation:
Herd immunity is a form of immunity that occurs when the vaccination of a significant portion of a population (or herd) provides a measure of protection for individuals who have not developed immunity
Usually within hours after eating the product.
The correct answer is A. interpersonal.
The other choices are false. Their meanings have nothing to do with the situation.
