Question at position 35 In hominins, bipedalism evolved as an adaptation to increased brain size.TrueFalse

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The question presents a true/false statement about hominin evolution: whether bipedalism evolved as an adaptation to increased brain size.
Option 1: True. This claim would assert that the development of walking on two legs was driven by or directly linked to larger brain size. In the fossil record and comparative anatomies, bipedalism appears well before significant brain expansion in hominins, with early bipedal traits showing up in Australopithecus and other predecessors long prior to modern brain sizes. Therefore, this option misattributes the sequence of evolutionary changes and is not supported by the established timeline.
Option 2: False. This choice correctly reflects the widely accepted view that bipedalism arose primarily for ecological and locomotive reasons—such as energy-efficient terrestrial travel, freeing hands for using tools, thermoregulation, and navigating open savannas—before notable increases in brain size occurred. The brain expansion in hominins occurred later in the genus Homo, after bipedalism was already established, making this statement accurate.
In summary, the assertion that bipedalism evolved as an adaptation to an increased brain size is not consistent with current evolutionary evidence, which places the origin of bipedal walking earlier than major brain enlargement. Thus, the false option accurately captures the temporal order of these traits.

Question at position 35 In hominins, bipedalism evolved as an adaptation to increased brain size.TrueFalse

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