
Some 365 million years ago, our fishy ancestors evolved limbs that enabled them to climb out of water and onto land — forming the evolutionary bridge to all terrestrial land mammals that would one day inhabit planet Earth, including humans.

Some 365 million years ago, our fishy ancestors evolved limbs that enabled them to climb out of water and onto land — forming the evolutionary bridge to all terrestrial land mammals that would one day inhabit planet Earth, including humans.