Which of the following changes for man in the course of evolution is probably useless?

Options

A. Development of being erect
B. Development of cranial capacity
C. Loss of tail
D. Development of opposable thumb.

Answer

To determine which of the changes in human evolution is probably useless, let's analyze each option step by step:

### Step 1: Analyze the Development of Erect Posture
- **Explanation**: The development of an erect posture allowed early humans to stand upright. This adaptation freed the forelimbs for tool use and carrying objects, and it provided better support for the musculoskeletal system.
- **Conclusion**: This change is useful for humans.

### Step 2: Analyze the Development of Cranial Capacity
- **Explanation**: The increase in cranial capacity in modern humans compared to their ancestors allowed for a larger and more complex brain. This adaptation is linked to advanced cognitive abilities, including critical thinking and problem-solving.
- **Conclusion**: This change is also useful for humans.

### Step 3: Analyze the Loss of Tail
- **Explanation**: The loss of the tail (or coccyx) in humans did not serve any significant function. While some animals use their tails for balance or communication, humans do not have a functional tail. The coccyx serves as a remnant of our evolutionary past without a major role in current human physiology.
- **Conclusion**: This change is likely useless for humans.

### Step 4: Analyze the Development of Opposable Thumb
- **Explanation**: The development of an opposable thumb allows for a better grasping ability, which is crucial for tool use and manipulation of objects. This adaptation has significantly contributed to human dexterity and the ability to perform complex tasks.
- **Conclusion**: This change is useful for humans.

### Final Conclusion
Based on the analysis, the change that is probably useless in the course of human evolution is the **loss of tail**.

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