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What does the circulatory system control?

  1. The body's ability to fight disease

  2. The steady circulation of blood through the body

  3. The growth and development of the body

  4. The protective covering of the body

The correct answer is: The steady circulation of blood through the body

The circulatory system is responsible for the steady circulation of blood throughout the body, delivering oxygen and nutrients to cells while removing waste products. It also helps regulate body temperature and maintain pH levels. Option A is incorrect because the immune system is responsible for fighting disease, not the circulatory system. Option C is incorrect because the endocrine and skeletal systems are primarily responsible for growth and development. Option D is incorrect because the integumentary system is responsible for the protective covering of the body.