Pls help. I have no brain cells at this point-_- This is a response of the immune system to a substance it incorrectly identifies as a
foreign pathogen.

A.humoral
B.immunity
C.antigen
D.allergies

The answer would be d

Crossing over is a process that happens between homologous chromosomes in order to increase genetic diversity. During crossing over, part of one chromosome is exchanged with another. The result is a hybrid chromosome with a unique pattern of genetic material.