The diagram shows a bacterial cell. What is the function of the structures labelled X? X codes for very specific features such as antibiotic resistance
X is responsible for movement of the bacterial cell
X is the site of most of the chemical reactions that occur in the bacterial cell
X is responsible for protection of the bacterial cell

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.