The following is not part of our bodies defense mechanism for infectious disease:
a. mucous membranes
b. red blood cells
c. white blood cells
d. antibodies

It's red blood cells. Mucous membranes can trap bacteria. White blood cell, eat the bacteria/pathogens/germs. Antibodies, like the white blood cell, destroy the pathogens.

Its red blood cells because they are not fully in your body

Yeah, the answer is definitely b.assuming that you're a high school student or middle school student, you probably don't need your parents' to pick out your clothes anymore. and i don't know how it works at other schools, but i know that at my high school, you don't get to pick the book you read for an english assignment. your teacher picks that. the decision of what after-school job i should get, i would definitely make with from my parents and other people that i trust. ultimately, the decision is up to me, but i would need advice from people who are more experienced.