The fossil serves as a chronological record documenting the emergence of new, more complex species from simpler ancestral forms. The fossil record also provides some examples of transitional species that provide evidence of ancestral links between species that exist today. | The fossil serves as a chronological record documenting the emergence of new, more complex species from simpler ancestral forms. The fossil record also provides some examples of transitional species that provide evidence of ancestral links between species that exist today. |