Active muscles demand huge amounts of oxygen, and the circulatory system works hard to provide it. Blood carries oxygen to the muscles. When the body is at rest, blood carries nutrients to the muscles so that they can repair and rebuild themselves. Blood also carries away the waste products that hard-working muscles produce, back out through the lungs to be filtered.
so they Circulatory system xx muscular system :)
Low birth weight, premature birth, miscarriage (fetus dies before the 20th week of pregnancy), birth defects (hearing issues, or heart defect)
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Progesterone. Progesterone, hormone secreted by the female reproductive system that functions mainly to regulate the condition of the inner lining (endometrium) of the uterus. Progesterone is produced by the ovaries, placenta, and adrenal glands.
Explanation:
Inhale and exhale because you inhale the oxygen and exhale the carbon dioxide
Answer:
a population or community.
Explanation: