as these distinguishing rocks were first studied in Devon, England. The Devonian, part of the Paleozoic era, is otherwise known as the Age of Fishes, as it spawned a remarkable variety of fish.
This suggests the gene network that makes the elastic cartilage in the fish gills became active in reptiles’ ear canal first and then in mammals’ outer ear. “So what we imagine is ...
When the first fish evolved, they might have repurposed the gill-forming genes from these ancient creatures. The bendy cartilage in mammals’ outer ears today, then, may be “the last remnant of ...
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Why do most mammals have 5 fingers?To answer the question of why mammals have five fingers ... five-finger plan first evolved. The first known animals to develop fingers evolved from fish around 360 million years ago and had ...
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