Proper tool use is a uniquely human trait that distinguishes humans from all other creatures. Even elaborate tool use among other species demonstrates a huge discrepancy between humans and animals, and some animal behaviorists are conducting experiments to assess how much of the gap between animal and human cognitive capacity can be bridged.Choice C is the best answer. The text claims that the use of tools creates a distinction between humans and animals and that some animal behaviorists are investigating the extent to which they can reduce such a gap. The word “discrepancy” means difference, and it accurately represents the disparity between humans and animals discussed in the text.
Choice A: “resemblance” means similarity, but the text makes it clear that the use of tools reveals the difference between animals and humans.
Choice B: “partnership” means collaboration, but the text does not indicate that tool use shows how humans and animals work together.
Choice D: “interaction” means communication. However, the text does not indicate that tool use would make humans and animals engage in communication.
✨ Expert's Tip ✨
Identify the main topic discussed throughout the text: the difference between humans and animals distinguished by the use of tools.