Bipedalism does have its downside, including:
A) it's harder to overcome gravity to supply brain with sufficient blood.
B) the weight on the body above the pelvis and lower limbs causes stress on the hips, lower back, knees, and feet.
C) females even have more stress during pregnancy.
D) all the above.

Question

Quizplus · Accepted Answer

Bipedalism can lead to various physical stresses and challenges, including the difficulty of supplying blood to the brain against gravity, increased stress on the lower body, and additional stress during pregnancy for females.

Bipedalism Does Have Its Downside, Including