Final answer:
The Linnaean classification system, developed by Carolus Linnaeus, is the commonly used classification system in biology. Linnaeus classified organisms based on their physical traits and is known as the "father of taxonomy."
Step-by-step explanation:
All modern classification systems have their roots in the Linnaean classification system. It was developed by Swedish botanist Carolus Linnaeus in the 1700s. He tried to classify all living things that were known at his time. He grouped together organisms that shared obvious physical traits, such as number of legs or shape of leaves. For his contribution, Linnaeus is known as the "father of taxonomy."