Earth's magnetic field:

a. changes over time
b. remains unchanged
c. does not affect solar winds
d. is not affected by solar winds

How does blood cycle from the heart to the lungs, back to the heart and out to the body? use the terms heart, lungs, arteries, veins, capillaries, cells, oxygen, and carbon dioxide. (6 points! ) be clear and specific! i recommend starting at the heart with your description.