27. . Wny do we need to study the effects of lifestyle in the function of respiratory and circulatory system? A. To help you detect and prevent diseases in the circulatory and respiratory system B. To help you explain the mechanism of how the respiratory and circulatory system work together C. To help you identify the key parts of the breathing system and describe the function of each part D. To help you identify the parts of the circulatory system and explain how oxygen-rich blood ransport to the different parts of the body 29. What is the human sex chromosome for male? A. XX В. YY C. XY D. XZ

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