Amniotic egg: [am knee ott ick] - an egg that can be laid on land due to the presence of a fluid-filled amniotic sac that cushions and protects the developing embryo
Bipedal: [bi pea dull] - describing an animal that typically walks on two legs.
Bony skeleton: a skeleton formed from hardened bone, not cartilage.
Common ancestor: an ancestor shared by two or more lineages.
Genealogy: [gee knee all oh gee] - a family history.
Hypothesis: [hi poth i sis] - a testable statement about the natural world that can be used to explain an observation and or make an inference.
Lineage: [lin ee edge] - any continuous line of descent; those organisms connected by heredity from ancestor to descendent.
Most recent common ancestor: the most recently shared ancestor of two or more lineages.
Quadrupedal: [qwa drew pea dull] - describing an animal that typically walks on four legs.
Tetrapod: [tet tra pod] - an animal having four limbs for terrestrial locomotion.
Vertebrate: an animal having a back bone or spinal column.