Homologous Structures & Common Ancestors Crossword

an organ or body part that appears in different animals and is similar in structure and location, but doesn't necessarily share the same purpose.
an ancestor that two or more descendants have in common.
a group of vertebrates comprising the reptiles and birds.
An extinct reptile of a Permian and Triassic order, the members of which are related to the ancestors of mammals
the process by which different kinds of living organisms are thought to have developed and diversified from earlier forms during the history of the earth
the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock
derived from organisms of a different but related species.
derived from organisms of the selfsame individual.
The earliest _______ evolved about 350 million years ago.
6,331 groups of genes common to all living animals have been identified; these may have arisen from a single common ancestor that lived 650 million years ago in the.