The tin can
A cell membrane, or cell wall.
the cytoplasm ;]
The tin can
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.
The cell membrane. And it also gives support to the cell.
A cell membrane, or cell wall.
Cells are surrounded by a cell membrane, also known as the plasma membrane. This thin, semi-permeable barrier separates the contents of the cell from its external environment while controlling the passage of substances in and out of the cell.
The Cell Membrane forms the outside boundary that separates the cell from its environment.
Selective permeability
Yes, the plasma membrane acts as a semi-permeable barrier that separates the contents inside the cell from its external environment. It regulates the passage of molecules in and out of the cell to maintain internal balance and protect the cell from potentially harmful substances.
The cell membrane is the outer boundary of a plant cell that separates its contents from the surrounding environment. Within the cell, membrane-bound organelles such as the nucleus, vacuole, and chloroplasts also help compartmentalize and protect the cell's contents. The cell wall, which is found outside the cell membrane in plant cells, provides additional structural support and protection.