Final answer:
Chimpanzees possess cognitive abilities like problem-solving and tool-making. While there is limited evidence on teaching them currency, studies have shown their capacity for abstract thought and the use of tools.
Step-by-step explanation:
Scientists have conducted several studies to understand the cognitive abilities of chimpanzees. While there is limited evidence on teaching chimpanzees what currency is, research has shown that they possess the capacity for abstract thought, problem-solving, and tool-making. One study demonstrated that chimpanzees could stack boxes to reach a banana, showcasing their ability to visualize the outcome before performing the action. Another study by Jane Goodall observed chimpanzees using tools like sticks and stones for hunting and food extraction. These findings suggest that chimpanzees have cognitive abilities that may be relevant to understanding the development of human language and culture.