The question is incomplete. There are no options given (for "which of the following") to answer this question.
The cell processes should also be included with the question for someone to know which is the right answer. Including this will allow someone to know which would separate into new cells.
A centrifuge.
Photosynthesis
paracrine signaling
Cell Membrane.
The tin can
A cell membrane, or cell wall.
the cytoplasm ;]
what separates prokaryotic and eukaryotic cells from the watery environment in which they exists
Cell contents are separated from the external environment by the cell membrane. Cells are also separated by the external environment when they are in the bloodstream in the capillaries and veins.
In cells without cell walls, the cell membrane forms an outside boundary that separates the cell from its environment!
Selective permeability
The Cell Membrane forms the outside boundary that separates the cell from its environment.
it encloses the cell and separates its contents from the surroundings.
In cells without cell walls, the cell membrane forms an outside boundary that separates the cell from its environment!
dna
In cells without a cell wall the cell membrane acts as the cell wall.