Chapter: The Cell - The Basic Unit of Life English : The cell is the basic structural and functional unit of life. It is a microscopic, self-contained entity that carries out various activities necessary for the survival and growth of an organism. Cells can be found in all living organisms, from simple single-celled organisms to complex multicellular organisms like plants and animals. The concept of the cell was first proposed by Robert Hooke in 1665 when he observed thin slices of cork under a microscope and saw small box-like structures, which he called "cells." Over time, advancements in microscopy and scientific research revealed that cells are not just empty boxes but are actually dynamic structures with intricate internal components. Cells are surrounded by a protective outer covering called the cell membrane, which regulates the entry and exit of substances. Within the cell membrane, there is a jelly-like substance called cyto...
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