A(n) _____________ is an animal that has a backbone made out of bone or cartilage.

The ____ -finned fish gave rise to tetrapods. 

 Where have similarities in vertebrate embryological development been shown? 

Fossils found in sedimentary rocks 

In ______________ dating, the age of a fossil is determined by using the age of the layers above and below the fossil. This is an indirect method and less  precise.

Which organism would have the most similar DNA to humans? 

The similarity between the forearm of a human and an alligator suggests that 

Where are MOST fossils found? 

Which of the following data of fossils would be most reliable? 

Why is Tiktaalik considered a transitional fossil?