○○○ bedrock ⪢⪢
Finally and most importantly, mountains have deformed bedrock, meaning the layers of rock beneath the
surface have been folded, faulted and tilted by the movement of Earth's crust.
http://qindex.info/i.php?x=16113
○○○ 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
• 14 Three-Dimensional Shapes Part 1: Types, Calculating Surface Area
