Which adaptation is constrained by the particular ancestral structure of the organism, resulting in a jury-rigged design?

Question

Quizplus · Accepted Answer

The anatomy that allows upright posture in humans is an example of an adaptation constrained by ancestral structure, leading to a jury-rigged design. This is because the human spine and lower body had to evolve from structures originally adapted for quadrupedalism (walking on four limbs) in our ancestors, resulting in compromises and inefficiencies in our bipedal (two-legged) posture and gait.

Which Adaptation Is Constrained by the Particular Ancestral Structure of the Organism