Which trait seen in Homo ergaster made him more human like?Straighter jawLarge eye orbitsLarger brainProtruding jaw

Analysis of Traits in Homo ergaster

Homo ergaster exhibits several traits that indicate a more human-like anatomy compared to earlier hominins. Let’s analyze each of the options provided:

1. Straighter Jaw: The straighter jaw of Homo ergaster suggests a reduction in the size of the teeth and jaw muscles, which is consistent with a diet that requires less raw plant material and more processed foods, similar to modern humans.

2. Large Eye Orbits: Larger eye orbits generally indicate a reliance on vision and potentially a diurnal (daytime) lifestyle, but this trait alone does not significantly contribute to a more human-like appearance regarding facial structure.

3. Larger Brain: Homo ergaster had a larger brain relative to body size than its predecessors. This increase in brain size is crucial for the development of advanced cognitive functions, social behavior, and tool use, making Homo ergaster considerably more human-like in terms of intelligence.

4. Protruding Jaw: A protruding jaw is characteristic of earlier hominins and indicates more primitive features, which does not align with the human-like qualities we associate with Homo ergaster.

Conclusion

The trait that made Homo ergaster more human-like is the larger brain. This characteristic reflects advanced cognitive abilities, which are fundamental in distinguishing Homo ergaster from earlier forms of hominins and aligning more closely with modern human traits.