What is civics? What does civics include? Explain the role of citizens in civics.

Civics is the study of the theoretical and practical aspects of citizenship, its rights and duties, the duties of citizens to each other as members of a political body and to the government. Civic responsibility can include participation in government, church, volunteers and memberships of voluntary associations.

the answers would be

the first one and the second one

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.