2. Which types of blood have the antigens that will react with anti-A antibodies?

They are of blood groups A and group AB.

Explanation:

The anti-A serum would cause blood containing red blood cells with antigen A to clump, while in the other antigen which is B serum would cause blood containing red blood cells with antigen B to clump. The clumping of red blood cells is called agglutination. Aside antigens A and B, red blood cells also contain another antigen called the Rhesus factor.

A simple agglutination test using an anti-Rhesus serum can identify if our blood is Rhesus positive ornRhesus negative.

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what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.