Cells are fundamental units of life from "summary" of A Short History of Nearly Everything: Special Illustrated Edition by Bill Bryson
Cells are fundamental units of life. They are the building blocks of all living organisms, from the simplest bacteria to the most complex human beings. Everything that is alive is made up of cells. This simple fact is one of the most fundamental principles of biology. Cells are incredibly diverse in their structure and function. There are thousands of different types of cells in the human body alone, each performing a specific role to keep the body functioning properly. Some cells, like red blood cells, are specialized for carrying oxygen throughout the body. Others, like nerve cells, are specialized for transmitting signals between different parts of the body. Despite their diversity, all cells share certain basic characteristics that make them fundamental units of life. One of the defining features of cells is their ability to replicate themselves. This proc...
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