Why are modern humans the only species to have chins? Researchers say it’s not due to mechanical forces, such as chewing, but may lie in our evolution: As our faces became smaller, it exposed the bony prominence at the lowest part of our heads.
Why are modern humans the only species to have chins? Researchers say it’s not due to mechanical forces, such as chewing, but may lie in our evolution: As our faces became smaller, it exposed the bony prominence at the lowest part of our heads.