Answer:
I believe it interacts with the lymphatic system (because it creates lymphocytes) and the circulatory system (because it creates red blood cells).
It helps with blending in with its environment, therefore keeping it safe from predators
Answer: Complex formation
Explanation:
Rheumatoid Arthritis is the condition in which the body's own immune system reacts with the own cells of the body considering as antigen.
The rheumatoid factor are the auto-anbodies that is produced from the immune system of the body.These antibodies binds to the Fc region of the IgG molecules.
There is a formation of complex that consists of the auto antibody and self antigen. This is the nature of interaction in case of rheumatoid arthritis.
A polar molecule has a positive and negative end because of electronegativity.