Question

Which evidence best supports the theory that birds and humans share a common ancestor due to homologous structures?

A. They both have tails as embryos.
B. They each have vestigial structures.
C. They have analogous structures.
D. They have different forms as adults

Answer 1

Birds and humans share homologous structures such as the arrangement of bones in their appendages, indicating they have a common ancestor, which is strong evidence for evolution.

Step-by-step explanation:

The evidence that best supports the theory that birds and humans share a common ancestor due to homologous structures is that both species have structures that exhibit the same basic form, which arose from a common ancestor. For example, the arrangement of bones in the appendages of humans and birds is similar because this layout was inherited from their common ancestor. Over time, while the shapes and sizes of these bones have evolved differently in each species, they maintain the same overall pattern. This provides strong evidence of descent from a common ancestor.