It should be based on the principles of immunology to understand this phenomenon: the immune system produces antibodies against an antigen that it does not possess
The AB group contains the A and B antigens on the red blood cells, so it can not produce anti-A antibodies or anti-B antibodies since it already possesses antigen A and B (otherwise it will develop autoimmunity).
Answer:
stomach and the small intestine
Explanation:
Gastroenteritis is an inflammation of the gastrointestinal tract in both the stomach and the small intestine.
Echinoderms are more closely related to human than to a jellyfish because they are biltarian.
I hope this helps!
Im gonna ask someone for ya hold on
I don't really get why changes in food sources tend to change classification systems I think it's when different plant species are increased as their would be needed an addition to the classification system. I'm not sure but I'd go for 2.