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Spirals through time

How do we know what Earth looked like long before humans appeared? Fossils provide many clues. From dinosaurs to tiny marine organisms, these remnants of the past preserve snapshots of ancient worlds that no longer exist.

Spirals through time
© J Nemchinova/Getty Images
2026-10-14 en-IN Oct 14, 2026

Ammonites were more closely related to which marine animals?

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