Avogadro's number was calculated by determining the number of atoms in 12.00 g of carbon-12. 14.00 g of carbon-12. 12.00 g of oxygen. 14.00 g of oxygen.

Generally travels west to east but often shifts to north and south

2hydrogen and 1 covalent

No because the eaeht is on a 23.5 degree axis tilt and so when it is winter the northern hemisphere is pointing away from the sun and the soutubern hemisphere is pointing toward the sun