Why is it harder for the earth to recover from some natural disasters now?

a) human influence may compound the damage.

b) the natural disasters have gotten worse.

c) this statement is not true.

d)the natural disasters all happen at the same time these days.

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.