Which of the following is a consequence of ocean acidification? A. Shorebird eggs are weakened and break more easily. B. Marine organisms that use carbonate (CO32–) as a building block to make calcified shelters are threatened. C. Swimmers may experience skin irritation from the acidified water. D. Carbonate (CO32–) accumulates to increase the pH of the water.

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.