Water is a POLAR molecule.
It is summer in June in the Northern Hemisphere because the sun's rays hit that part of Earth more directly than at any other time of the year. It is winter in December in the Northern Hemisphere, because that is when it is the South Pole's turn to be tilted toward the sun.
They are ACU, ACC, ACA, ACG
Blood leaves the heart through the pulmonic valve, it then moves through the pulmonary arteries which branches to the left and right lungs.
When the deoxygenated blood reaches the lungs, it is then oxygenated and returns to the heart through our pulmonary veins.
Hope this better explains it!
