Question

Which of these provides evidence from developmental biology of a shared evolutionary history?

Answer 1

the leg of the whale and the skeletal structure of it provides the evidence from developmental biology of a shared evolutionary history.

Answer 2

Evidence for any direction in evolution is however hard to acquire from developmental biology of a shared evolutionary history.

Homologous hox genes in such different animals as insects and vertebrates control embryonic development and hence the form of adult bodies.

These genes have been highly conserved through hundreds of millions of years of evolution.