Enlist four peculiar features of human evolution.

Explanation

**Step-by-Step Solution:**

1. **Erect Posture**: One of the most significant features of human evolution is the development of an erect posture. Early human ancestors had a lumbar spine that was curved, causing them to bend forward. Over time, this lumbar curve evolved to become straighter, allowing for an upright stance. This change facilitated bipedal locomotion, which is a defining characteristic of modern humans.

2. **Increase in Brain Size**: Another peculiar feature is the increase in brain size, also referred to as cranial capacity. Modern humans have a cranial capacity of approximately 1400cc to 1500cc, which is significantly larger than that of early hominins, whose cranial capacities ranged from 200cc to 300cc. This increase in brain size is associated with higher intelligence and cognitive abilities, which played a crucial role in human evolution.

3. **Development of Chin**: The evolution of the chin is another notable feature. Early human ancestors had a more pronounced, protruding chin, but as evolution progressed, the chin became less prominent and more aligned with the facial structure. In modern humans, the chin is perpendicular to the facial plane, which is a distinct characteristic of our species.

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