Which physiological constraint required *Liopleurodon* to remain tethered to the surface for respiration?

Answer

It possessed lungs, being a reptile

As a reptile, *Liopleurodon* had lungs, necessitating periodic surfacing to breathe, similar to modern whales or seals, which constrained its prolonged deep-sea pursuits.

Which physiological constraint required *Liopleurodon* to remain tethered to the surface for respiration?
reptilespeedswimPrehistoricLiopleurodon