BIOLOGY - Cells - What Are Cells

Cells are the fundamental building blocks of all living organisms, from simple bacteria to complex humans. They vary in size and function, with some visible to the naked eye, like a chicken egg yolk, and others requiring a microscope. The human body contains around 50 trillion cells, each performing specific tasks. While some cells operate independently, most work together in multicellular organisms to perform complex functions, such as heart cells pumping blood. Understanding cells' diversity and roles is crucial to comprehending life itself.

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