How did early modern
scientists learn about
cells without performing
experiments?

The way early modern scientists learned about cells was by using a microscope. The invention of the microscope, an instrument that makes small objects look larger, made this discovery possible.

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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.