The answer is red blood cells because they only give your body oxygen and can be the victims of infectious diseases, while all the other choices protect you from it
Answer:
Self-esteem
Explanation:
In psychology, the word 'self-esteem'is utilized to depict an individual's general feeling of self-esteem or individual worth.
It can also be defined as the amount you acknowledge and like your own self. Self-esteem is regularly observed as a personal characteristic, which implies that it will in general be steady and persevering.
Self-esteem is significant on the grounds that it vigorously impacts individuals' decisions and choices.
Self-esteem serves a persuasive capacity by making it pretty much likely that individuals will deal with themselves and investigate their maximum capacity.
O M G i just did that one on Plato
well anyway i think the answer was the the skin because any thing that invades the body is a threat to the immune system.