The research led by Felix Warneken has proved that ______.A.chimpanzees' cooperative abili
The research led by Felix Warneken has proved that ______.
A.chimpanzees' cooperative ability has always been present
B.chimpanzees are as intelligent as 18-month old human children
C.chimpanzees and humans had common ancestor six million years ago
D.chimpanzees are willing to cooperate even without any form. of reward