Brownsville is a borough in Fayette County, Pennsylvania, United States, officially founded in 1785 located 35 miles (56 km) south of Pittsburgh along the Monongahela River.
2nd Item Specification: Given a group of organisms and a key, classify organisms based on observable characteristics. Depth of Knowledge Level 1. 1  A tool used by scientists to identify unknown organisms based on observable characteristics is called a. 2  dichotomous key.
Cladistics is useful for creating systems of classification. Cladistics is now the most commonly used method to classify organisms. Why do we need to classify organisms? Well, consider the bewildering variety of organisms that have ever lived on Earth, from jellyfish to bacteria â that's what paleontologists do for a living.