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26 October, 22:55

Blood cells are produced in which system?

A. circulatory system

B. immune system

C. skeletal system

D. endocrine system

User:

Heart disease includes all of the following risk factors except

A. high blood pressure

B. high cholesterol levels

C. cigarette smoking

D. regular exercise

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Answers (1)
  1. 26 October, 23:15
    0
    C. skeletal system

    D. regular exercises
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