Reading — Test 54

Read the passage and answer the question.

Octopuses have a remarkable way of moving information around their bodies. About two-thirds of their nerve cells are located not in the central brain but in their arms. Each arm can sense and react to its surroundings somewhat independently, even tasting food it touches. This arrangement lets an octopus explore several crevices at once without the brain directing every motion. Scientists believe this distributed control helps the animal manage its many flexible limbs efficiently, since coordinating eight arms from a single center would be slow and demanding.