Where have similarities in vertebrate embryological development been shown? 

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

Which organism would have the most similar DNA to humans? 

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.

Where are MOST fossils found? 

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

Why is Tiktaalik considered a transitional fossil? 

A(n) ____________ is an animal that has mammary glands and fur.

The time it takes for a radioactive isotope to break down 50% is known as the ______________ .

In the milieu of the  theatre, how was the attention of the audience gotten before the beginning of the opera?