The initial lack of opposability of the hallux in humans is most likely the result of:

Question

Quizplus · Accepted Answer

The transition to bipedalism (B) required the hallux to become more aligned with the other toes in order to provide support and stability during walking and running. The need to use the hallux in terrestrial movement (A) also contributed to the loss of opposability, as the hallux became more specialized for weight-bearing and propulsion.

The Initial Lack of Opposability of the Hallux in Humans