○○○ gulp ⪢⪢
But if that doesn't work, like if there is not enough oxygen in the water, the axolotl has a backup, fully functional lungs. It can use to gulp air from the surface. These organs are evolutionary leftovers from when its ancestors lived on land.
http://qindex.info/i.php?x=16131

○○○ Charles Darwin ⪢⪢
Charles Darwin made what might be the most important scientific discovery of all time, the theory of evolution by natural selection.
http://qindex.info/i.php?x=12925

• On The Origin Of Species
How do we explain how animals have evolved over time. Charles Darwin, the British naturalist and geologist, famously answered this question in his book 'On The Origin Of Species' which proposed the mechanism of evolutionary change within animal species.
http://qindex.info/i.php?x=4766

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