Final answer:
The key features used to classify a hominoid fossil in the human evolutionary line are bipedalism, upright spinal column, and large skull.
Explanation:
To definitively classify a hominoid fossil as part of the human evolutionary line, several key features are examined:
- Bipedalism: The adaptation to upright walking is a significant trait in the human evolutionary line, as seen in specific pelvis structures and leg bone angles.
- Upright Spinal Column: An upright posture, indicated by features like the positioning of the foramen magnum, is crucial in identifying fossils along the human evolutionary path.
- Large Skull: Traits like brain size, skull shape, and tool use are considered in classifying hominins as part of the human evolutionary line.
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