The different lengths of human fingers may come from the competition of living environment. The author tries to infer from the perspective of evolution that it is only a very short time (5,000 years compared with 3 million to tens of millions of years) for human beings to escape from the life in the jungle and finally establish the civilization history of tribes and polis. Therefore, the different lengths of human fingers may be caused by the competition of jungle survival and the living state of human beings in the jungle. Including picking fruits from dense trees, picking insects from anthills, or picking internal organs from prey (these are all possible ways for apes to feed at present), then suppose there are two groups of apes, each group is 65,438+0,000, and the difference between the two groups is that one group has equal fingers (both are square palms) and the other group is the same as us (. And let them compete for food together, we can guess that the result may be that the family with their palms closed like arrows can get food faster and in some small places (it is more useful when food is scarce). In the end, this family will beat the other and survive. Therefore, the length of human fingers is not equal, and the combination is the sharp shape of the arrow, which may be the result of evolutionary competition. However, if there are other more scientifically verified objective statements, please refer to Vgisriboso00673687342012-8-19 Sunday 05: 17:23.