Answer:
you could use styrofoam for the planets and the sun and paint them, for rings around planets you could use pipe cleaners and use a styrofoam bottom and have sticks to secure the planets
Explanation:
The blood vessels dilate to increase the "blood traffic" through the lungs to carry more oxygen to the muscle. The lungs work harder (faster respiratory rate) to increase the rate of oxygen/carbon dioxide exchange in the lungs.
The correct answer is:
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4 — a mid wife .
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C. Take a look at the pic below for the reasoning