Which of these could represent the second step of inquiry?
Monica predicts that the warm setting on the washing machine
will get clothes the cleanest.
O
B. Monica washes three separate loads of very dirty laundry: one on
the cold setting, one on the warm setting, and one on the hot
setting.
O
C. Monica wonders which temperature setting on the washing
machine gets clothes the cleanest.
O
D. Monica writes down what three loads of laundry look like before
and after she washes them on the cold, warm, or hot setting.

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.