The ________ is a system of cells and chemicals in the body that recognizes invading organisms and substances and works to get rid of them or make them harmless.
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Q62: Single-celled organisms called _ can be found
Q63: _ is a common bacterium in the
Q64: If a microorganism causes an illness in
Q65: A(n)_,consisting of a piece of DNA or
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Q68: The first cellular line of defense against
Q69: In the chain of infection,the _,or pathogen,is
Q70: In the chain of infection,the _ is
Q71: Immunity that develops after exposure to an
Q72: A pathogen's _ is the speed and
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