Which of the following is not true about the antigens?
a. they have immunogenicity which means they provoke immune responses
b. they have reactivity which means they react with the antibodies or cells they provoked
c. they are often large protein molecules
d. they always invade the human body from the external environment
e. they may be natural or man-made molecules

d. They always invade the human body from the external environment

Explanation:

Antigens are the molecules that have the ability to stimulate immune response and are mostly protein in nature. However, an antigen may be self or non-self molecule.

This means that antigen may enter the human body from the external environment (the non-self antigen) or any molecule present inside the body may serve as antigen (self-antigen). Self-antigens are responsible for autoimmune disorders.

i'm gonna put a couple so you can chose from

explanation:

if you know the fur color of the offspring mice, you can use the ratios to identify the genotypes of the parents.

if either parent mouse passes a dominant allele, the offspring will have black fur.

if the parental mice has two different fur color (i.e white and black) , the color of the offspring's fur would be either black, white, or the combination of both (grey)

hope this : )

a=c and then d= c because of the band so you get ac/dc and you add them together you get sound waves