Which energy source generates the least greenhouse gases?
o a. solar
o b. oil
o c. coal
o d. natural gas
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Plzz hurry im being timed during times of vigorous physical activity, muscles require a constant supply of oxygen. how does the body respond to these needs? a. breathing rate and heart rate both decrease. b. breathing rate and heart rate both increase. c. heart rate decreases, but breathing rate remains stable. d. breathing rate increases, but heart rate remains stable.

If you are in a chronic state of anxiety but also suffer from moment of sudden, intense fear you are problably suffering. from

Where do the respiratory and circulatory systems meet? a. in the heart b. in the muscles c. in the lungs d. in the brain