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We know little about how embryonic development in animals evolved from single-celled ancestors, but simple organisms with a multicellular life stage offer intriguing clues
Attempts to harmonize living fossil research with mutation research fail
Starfish feet are coordinated purely through mechanical loading, enabling the animals to bounce rhythmically along the seabed without a central nervous system
In a groundbreaking experiment in the early 1950s, a scientist tried to re-create the conditions of early Earth in a test tube.
Flowering plant-type leaf veins died out and re-evolved several times in the course of the Earth's history