The forelimbs of humans, bats, and whales all contain a similar arrangement of bones (one upper arm bone, two forearm bones, many wrist bones). What is the best explanation for this similarity?

This is the only possible bone structure that can support a limb.

Humans, bats, and whales all evolved from a common ancestor that had this limb structure.

It is a random coincidence that these different species developed the same bone pattern.

This bone arrangement evolved independently in each species because it is the most efficient design for their different environments.

The specific "1-2-Many" bone pattern in mammalian limbs is a classic example of a homologous structure. What is the primary reason this pattern is classified as homologous?

The limbs in all these mammals perform the exact same function.

The shared anatomical layout was inherited from a common ancestor.

The pattern is the simplest and most common way for a limb to form.

The bones in each species are identical in size and shape.

The animal must have been able to fly.

This specific bone structure is a random evolutionary coincidence.

The extinct mammal likely shares a common ancestor with modern mammals like cats and humans.

This is the only bone configuration that could have possibly evolved to form a functional limb.

Evolutionary pathways are constrained by ancestry.

Adaptations are always perfectly suited to their function.

All complex structures arise from random chance.

Function is unrelated to anatomical structure.

The bones of the wrist (carpals)

The bones of the fingers (digits)