Mainly there is cell wall at the outer of prokaryotes ! but not have cell wall as PPLO or mycoplasma don't have cell wall !
Answer: A) Atom, Molecule, Cell
Explanation: An atom is the smallest unit of ordinary matter. Atoms can join together to form molecules, which in turn form most of the objects around you. And molecules join together to form cells.
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This means that they each have there own part in the cell, think baseball team. there are different players but you work together