in what stage of the cell cycle do chromosomes make identical copies of themselves?

answer:

then, at a critical point during interphase (called the s phase), the cell duplicates its chromosomes and ensures its systems are ready for cell division. if all conditions are ideal, the cell is now ready to move into the first phase of mitosis.

nacl is added to the aqueous of what? ? in order to get a proper answer you have to specify the exact composition of the aqueous solution.

the electron configuration that you gave me has 16 electrons ergo it has 16 protons ergo it is the element sulfur.