3. Antibodies fight infections by
(a) eating microbes before they can attack cells.
(b) binding to antigens and rendering them inactive or harmless.
(c) injectiſg cells with a harmless form of an otherwise harmful virus.
(d) creating white blood cells.
4. Immunity occurs when the system recognizes a foreign substance and

Look at the illustration of four letters from the american manual alphabet. decide whether the description of the letter is a good definition. if not, choose a counterexample. the letter i is formed by sticking up the smallest finger and folding all the other fingers into the palm of your hand with the thumb folded over them while keeping your hand still.