But they have a common ancestor. Explain why both fossils and DNA form the same nested hierarchy, using the same reasoning we use in courtrooms to demonstrate parentage.
http://www.tolweb.org/tree/phylogeny.html
http://www.tolweb.org/Animals/2374
http://www.tolweb.org/Bilateria/2459
http://www.tolweb.org/Deuterostomia/2466
http://www.tolweb.org/Chordata/2499
http://www.tolweb.org/Craniata/14826
http://www.tolweb.org/Vertebrata/14829
http://www.tolweb.org/Gnathostomata/14843
http://www.tolweb.org/Sarcopterygii/14922
http://www.tolweb.org/Terrestrial_Vertebrates/14952
http://www.tolweb.org/Amniota/14990
None of the major proponents of intelligent design deny common descent, so what is your competing hypothesis?