Antigens are any molecules that elicit adaptive immune response. Antigens protrude from pathogens or other intruding substances. Antibodies are proteins found in blood plasma that attach to one particular kind of antigen and help to counter its effects.
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In my opinion i think fevers are helpful because when we are feeling bad we can test our temperature with a thermometer. Also fevers turn on the body's immune system. So therefore they help the body fight infection.
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