narwhals are aquatic mammals known for the giant tusk that protrudes from their upper lip. these mammals live in arctic waters and can spend more than three hours at a time underwater at great depths that would crush other animals. the narwhals ability to endure such long underwater dives is an example of a(n)

Respuesta :

Adaptation I believe, I found a website that said the same thing. :)                                                     

Answer:

Adaptation  

Explanation: