The cell membrane functions as a selective barrier. We call these kind of membranes as differentially permeable or semi permeable membrane. It can decide what substances can pass in and out. Therefore it can surround the cytoplasm (which is the inside of a cell) to separate the cell's content from the surroundings.
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The crust is the top layer of earth, mostly covered with dirt and rocks. Other layers are rock or molten rock. The top layer is way cooler than the other layers, the closer you get to the Earth's core, the higher in temperature the layer is.
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