Humans are unique in that they have the:
A) largest brain of any animal species.
B) most complex spinal cord of any animal species.
C) largest brain to body size ratio of any living animal.
D) most advanced nervous system of any living animal.

Question

Quizplus · Accepted Answer

While A and D are partially correct, as humans do have a relatively large brain and advanced nervous system, C is the most accurate answer. The ratio of brain size to body size is a better indicator of cognitive abilities than just the size of the brain or nervous system. Humans have the largest brain to body size ratio of any living animal, which is thought to contribute to our advanced cognitive abilities such as language, problem-solving, and complex thought processes.

Humans Are Unique in That They Have The