Which of the following characteristics separates humans from chimpanzees and other apes?

• A. Opposable thumbs
• B. Bipedal locomotion as the primary mode of movement
• C. Use of simple tools
• D. Presence of body hair

Answer: (B)

Verified step by step guidance

1. Understand the key differences between humans and chimpanzees/other apes. Humans and apes share many traits, such as opposable thumbs, the use of simple tools, and the presence of body hair. However, one trait is unique to humans as a primary mode of movement: bipedal locomotion.
2. Define bipedal locomotion. Bipedal locomotion refers to walking on two legs as the primary mode of movement, which is a defining characteristic of humans compared to other apes that primarily use quadrupedal locomotion or knuckle-walking.
3. Consider the evolutionary significance of bipedal locomotion. Bipedalism allowed humans to free their hands for tool use, carrying objects, and other activities, which contributed to the development of advanced cognitive and social behaviors.
4. Compare the other options provided in the question. Opposable thumbs, use of simple tools, and presence of body hair are traits shared by both humans and other apes, so they do not uniquely separate humans from apes.
5. Conclude that bipedal locomotion is the correct answer because it is the primary mode of movement unique to humans, distinguishing them from chimpanzees and other apes.