Vertebrate Land Invasion
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In the late Devonian period, vertebrates such as Tiktaalik and Acanthostega
evolved legs that allowed them to colonize the land. Fish had already evolved
lungs in response to oxygen-depleted ocean conditions and to maintain buoyancy
in the water, but other adaptations, such as neck mobility and hard-shelled eggs,
were also critical to fully colonizing the new terrestrial environments.
Tap Evolve to become a land animal!