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Me d: which system contains the heart, blood, and blood vessels? a. muscular b. circulatory c. respiratory d. digestive which system contains the pituitary, adrenal, and thyroid glands? a. respiratory b. circulatory c. endocrine d. reproductive
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Why does the body need calcium and what are the symptoms of calcium deficiency?
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Which std is caused by a small bacterium called a spirochete that attacks many parts of the body? a. genital herpes b. hiv c. chlamydia d. syphilis
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Which technology keeps track of heart rate during a workout?...
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