Does the fish-to-tetrapod transition mean humans evolved directly from fish? While humans are distantly related to fish, we did not evolve directly from modern fish.
When considering the idea of humans “coming from fish,” it is important to understand that evolution does not describe a direct, linear transformation from a modern-day fish species to humans. Instead, it refers to a shared common ancestor that existed millions of years ago.
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Our first clue that fish and humans are kin lies in our skeleton. Beneath the skin, a human arm has one bone, then two, then many tiny bones—just like the fin of an ancient lobe-finned fish. The genetic instructions for this blueprint are astonishingly old.
One of the most significant events in the history of life was when fish evolved into tetrapods, crawling out of the water and eventually conquering land. The term tetrapod refers to four-limbed...
Discoveries of fish fossils from the two depositories help to trace many human body structures back to ancient fishes, some 440 million years ago and fill some key gaps in the evolution of “from fish to human,” and provide further iron evidence to the evolutionary path.