When developing an experimental design, which action would improve the quality of the results?
A. Ensure that it answers a question about cause and effect.
B. Have a different researcher make the measurements
C. Include as many responding variables as possible.
D. Keep the sample size of test subjects to a minimum

um i think it might be a car?

c. electrical charges of ionic bonds.

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.