Question

Which of the following is not in the direction of evolution of human species?

• A. Raised orbital ridges
• B. Binocular vision
• C. Opposable thumb
• D. Developed brain

Answer 1

The correct option is A Raised orbital ridges

The brow ridge, or supraorbital ridge refers to a bony ridge located above the eye sockets of all primates.

In Homo sapiens (modern humans) the eyebrows are located on their lower margin.

The great apes have a relatively pronounced supraorbital ridge, which has also been called a frontal torus while in modern humans it is relatively reduced.

The fossil record indicates that the supraorbital ridge in early hominins was reduced as the cranial vault grew; the frontal portion of the brain became positioned above rather than behind the eyes, giving a more vertical forehead.

So, the correct option is 'A'.