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

Options

A. raised orbital ridges
B. binocular vision
C. opposable thumb
D. developed brain

Answer

To determine which of the following is not a direction of evolution of the human species, we need to analyze each option provided:

1. **Supraorbital Ridge**: This refers to the bony ridge located above the eye sockets. In early hominins, this ridge was pronounced, but in modern humans (Homo sapiens), it is relatively reduced. Thus, the trend in human evolution shows a decrease in the prominence of the supraorbital ridge.

2. **Binocular Vision**: This is the ability to perceive depth and three-dimensional structure due to the positioning of the eyes. Binocular vision is a characteristic that has evolved in primates, including humans, and is advantageous for survival and hunting.

3. **Opposable Thumb**: The opposable thumb is a significant evolutionary trait that allows for grasping and manipulation of objects. This trait is essential for tool use and has evolved in humans, enhancing our ability to interact with our environment.

4. **Developed Brain**: The evolution of a larger and more complex brain is a hallmark of human evolution. This development has led to advanced cognitive abilities, problem-solving skills, and social interactions.

Now, evaluating the options, we find that the **supraorbital ridge** is the only feature that does not represent a direction of evolution towards more advanced traits in humans. Instead, it indicates a reduction in a feature that was more prominent in earlier hominins.

**Final Answer**: The option that is not a direction of evolution of the human species is **Supraorbital Ridge**.