Which is not a reason why the mass of an atom is expressed in atomic mass units rather than in grams? Scientists could not agree on a standard.

Atomic mass allows for mass differences in isotopes.

The mass in grams is too small to be useful.

Atomic mass units make it easier to compare the masses of atoms.

scientists could not agree on a standard

it takes about 30 days for it to break down

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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