Which of the following has giant unmyelinated axons, up to 1 mm in diameter, that enable rapid response when escaping from predators?

A) Horses
B) Lizards
C) Squirrels
D) Birds
E) Squids

Squids have giant unmyelinated axons, which are among the largest in diameter in the animal kingdom. This adaptation allows for very rapid nerve conduction speeds, enabling squids to respond quickly to threats by facilitating fast muscle contractions for escape.