Final answer:
The cell membrane is the structure that separates the cytoplasm from the external environment and plays a vital role in protecting the cell.
Explanation:
The cell membrane (plasma membrane) is the structure that separates the cytoplasm from the external environment, acting as the boundary of the cell. Cytoplasm refers to the cellular material inside the cell, excluding the nucleus, and is composed of cytosol containing various organelles like ribosomes where proteins are made. The cell membrane plays a crucial role in protecting the cell and regulating the passage of substances in and out of the cell.
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