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Assignment 5: Dichotomous key Prior to evolutionary theory, scientists relied on similarity of physical characteristics to classify organisms. An 18th century naturalist, Carolus Linneas, developed a taxonomic classification system. This hierarchical system divides organisms into 5 kingdoms. Organisms visible to the unaided human eye fall into the plant, animal, or fungi kingdom. Kingdoms are then divided into phylum. This division is based body type and skeletal organization. Phylum are then divided into subphylum. Subphylum are divided into classes, orders, genus, and then species. This system of classification is still used by scientists today1. In this assignment, seven organisms are presented which are to be classified into phylum or class based on a dichotomous key. The first organism presented in this assignment is a starfish. Starfish fall into the class Asteroidea. Starfish have a regular body shape with radial symmetry. It has arms which extend from a central disk and has a...

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