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The Tree of Life: Read an exclusive excerpt from a new book by Max Telford
In 1665, Robert Hooke's groundbreaking work, *Micrographia*, revealed the intricate details of microscopic life, including a flea magnified 300 times. Hooke's observations laid the foundation for understanding animal complexity, highlighting multi-cellularity and cooperation among cells. The evolution from single-celled organisms to diverse animal forms is traced through genes and behaviors in modern relatives like choanoflagellates, emphasizing evolutionary connections.

