Question

Among all primates, humans have the

Group of answer choices

greatest number of adaptations for quadrupedal locomotion.

most moderate brain-to-body-size ratio.

largest brain relative to body size.

largest degree of sexual dimorphism.

Answer 1

Humans have the largest brain relative to body size among all primates, which correlates with advanced cognitive abilities. Our evolution has led to unique characteristics such as bipedalism, smaller front teeth, and larger molars.

Step-by-step explanation:

Among all primates, humans have the largest brain relative to body size. This is evident in the significantly increased size of the human cerebrum, particularly in the frontal lobes, which is correlated with higher intelligence and complex behaviors.

Unlike other primates, who mostly show adaptations for climbing trees and quadrupedal locomotion, humans have evolved a set of unique characteristics such as a fully upright posture resulting in bipedalism, the shortening of the arms relative to the legs, and increased dexterity of the hands.

Additionally, humans have small front teeth compared to other primates but have very large molars. These adaptations are indicative of the different evolutionary path humans have taken within the primate order.

Answer 2

Among all primates, humans have the largest brain relative to body size.

Step-by-step explanation:

Among all primates, humans have the largest brain relative to body size. This is known as encephalization, and it is a unique characteristic of humans compared to other primates. Even though humans have a moderate brain-to-body-size ratio, our brain size is much larger than expected for our body size.

Learn more about human brain size and body size comparison