Identify the bone of the lower limb that bears the least amount of weight.

The Fibula

Explanation:

The fibula is the long, thin and lateral bone of the lower leg. It runs parallel to the tibia, or shin bone, and plays a significant role in stabilizing the ankle and supporting the muscles of the lower leg. Compared to the tibia, the fibula is about the same length, but is considerably thinner.

the fibula

Explanation:

Fibula is a slender and long bone located on the outside of the lower leg, from outside and underneath the knee and extends down to form the outside of the ankle joint. ... Fibula bone plays a minor role in bearing the weight of the body as we walk. The tibia bears approximately 80% of the body weight.

from the original order (top to bottom) the new order will go

1 (founder)

4 (hawk)

2 (mutate)

3 (next generation)