82. One of the most obvious, visible, physical differences between apes and monkeys is that

Question

BlackTom AI · Accepted Answer

Monkeys have tails while apes lack external tails, so "monkeys have tails and apes don't" is the correct distinguishing feature.

1) Relevant knowledge points and concepts
- Primate classification: apes (hominoids: gibbons, orangutans, gorillas, chimpanzees, humans) versus monkeys (New World and Old World monkeys).
- External tail anatomy: most monkeys possess visible tails (New World monkeys often have prehensile tails; Old World monkeys have non-prehensile tails). Apes characteristically lack an external tail.
- Vision and digit morphology: both groups generally have forward-facing eyes (binocular vision) and flattened nails instead of claws in most species; color vision is common in many primates, though it varies by lineage.

2) Step-by-step reasoning
- Compare option A: "apes have binocular vision and monkeys don’t." Both monkeys and apes have forward-facing eyes and binocular overlap; thus A is false.
- Compare option B: "monkeys have tails and apes don't." Monkeys typically display external tails; apes uniformly lack external tails. This is a clear, visible morphological difference.
- Compare option C: "monkeys have claws and apes don’t." Most monkeys and apes have nails rather than true claws (with a few small exceptions in some species), so C is an inaccurate generalization.
- Compare option D: "apes have color vision and monkeys don’t." Many monkeys (especially Old World monkeys) and apes share trichromatic color vision; New World monkeys show variation, so D is incorrect as a blanket statement.

3) Calculations/intermediate steps
- Not applicable (conceptual comparison rather than numeric).

4) Why the correct answer is correct
- The presence versus absence of an external tail is a consistent, observable anatomical difference across these groups: apes lack tails, while most monkeys have them.

5) Why other options are incorrect (brief)
- A: Both groups have binocular vision. C: Both groups generally have nails, not claws. D: Color vision occurs in many monkeys as well as apes.

6) Conclusion
- The correct choice is "monkeys have tails and apes don't," which matches the provided answer.

82. One of the most obvious, visible, physical differences between apes and monkeys is that单项选择题

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