Why does the thumb on human fingers have two joints? It is conducive to the use of tools. These are the latest questions and answers on Alipay Ant Manor today. Users who usually participate in activities can quickly take away the answers to complete the questions. Today's latest chicken feed can be collected with one click and easily feed the chickens.
Conducive to using tools
Inherited from ancient apes
Answer: Facilitates the use of tools
Knowledge expansion: This structure is the inevitable result of long-term human evolution. It is to make human hand activities more flexible and powerful, and is a manifestation of human adaptation to the environment in the process of evolution.