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When a germ enters the body the immune system mounts up an army and defense system to destroy that germ. the body produces to you lock onto the germ also known as antigen
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The acts as the internal clock that controls sleep and waking cycles. a. hypothalamus b. pineal gland c. ovaries d. thyroid
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When a germ enters the body the immune system mounts up an army and defense system to destroy that g...
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