Different isotopes of the same element must have a different mass number
The correct answer of the given question above would be FLAGELLA. The structure that makes it possible for some kinds of prokaryotic cells to move around is the FLAGELLA. Prokaryotic cell is one of the types of cells. The other type is the Eukaryotic cell. This cell is found in two Kingdoms of life which are Archaea and Bacteria. Hope this answer helps.
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Potassium is placed where it is based on its properties and it's reactivity. It's also placed there based on it's atomic number.
