The best evidence that the Earth has a spherical shape is provided by A) photographs of the Earth taken from space satellites
B) the amount of daylight received at the North Pole on June 21
C) the changing orbital speed of the Earth in its orbit around the Sun
D) the cyclic change of seasons

a corroding iron, if that's one of your choices

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.