Part the red sea...
Bat, Ball, Wickets, and Pitch
Yes...different enzymes work more efficiently at different pH levels and temperatures
Four chambers. Right Ventricle Left Ventricle Right Atrium Left Atrium
All veins carry blood back to the heart... The only vein which doesn't carry oxygenated blood is the pulmonary vein which is oxygenated by air directly from the lungs.
It would have no structure...
Dissolved in solution.
An oxygen molecule consists of two oxygen atoms and a double bond. You could use two balls and two straws.