1. What aspects of skeletal anatomy indicate bipedalism in early hominins?

Answer:

The morphology of their femurs and the positioning of their skulls on their vertebral columns.

2. Despite being bipedal, what is mentioned about the brains of early hominins?

Answer:

The brains were of a size and configuration virtually indistinguishable from some species of fossil and modern apes.

3. What is the fundamental characteristic of the first hominins mentioned in the passage?

Answer:

The fundamental characteristic is bipedalism.

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