The atomic mass of an element whose atoms consist of eight protons, nine neutrons, and eight electrons is what?

Which layer will become saturated first when rain falls?

Which mechanism of transport takes place when solute particles move from a region of high concentration to a region of low concentration? active diffusion isotonic osmosis

What environmental cues and landmarks do the geese use to determine the timing and direction of their migration over the mountains? how do they find their way?