What philosophical work did Haeckel write?
The World as Will and Representation
The Gay Science
The Riddle of the Universe
Zeitgeist
Answer
Haeckel's book The Riddle of the Universe was an attempt to provide a synthesis of science and philosophy, and was one of the most popular scientific books of the late 19th century. In it, Haeckel argued that all life was descended from a single cell, and that the history of life could be understood as a process of evolution.
Exploring the Extraordinary: The Remarkable Life of Ernst Haeckel
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