O air-filled cavities that secrete mucus to keep the nose moist and remove bacteria.
Answer:
A. The atria are contracting and pushing blood into the bottom ventricles of the heart.
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Answer:
Yes
Explanation:
Too much exercise leads to over exhaustion and possible injury.
Answer:
A. subsequent pregnancies spaces 18 or more months apart
Explanation:
This seems to be less likely for a premature birth because it is recommended that a mother should wait at least 18 months between giving birth and getting pregnant again. This is the minimum time span for a safe and successful pregnancy.
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