Scientists classify animals to provide a standardized system of identifying and describing organisms that exhibit similar characteristics. Despite the vast diversity of animal species on Earth, categorizing these organis... More » Science Biology Zoology

People classify things as an organizational tactic, according to The American Society for Microbiology. Classification helps people monitor items, animals, people and events. It also helps people to contrast and compare ... More »

Scientists classify living things to make it easier to study and understand the behaviors, lives and evolutionary progression of millions of life forms. They use a system known as taxonomy to classify living things into ... More »

Most animals are made up of more than one cell, have cells that group into tissue, reproduce sexually, are capable of movement and ingest other organisms to obtain energy. There are exceptions to many of these characteri... More »

Biologists classify organisms to organize and keep track of the enormous variety of life forms, to better understand evolutionary distances, and to examine the relationships between organisms. Life on earth is incredibly... More »

Although members of the kingdom Animalia are almost exclusively multicellular, there are several unicellular organisms classified as animals, including species of bacteria, protozoa, fungi, algae and archaea. Bacteria ar... More »

All organisms that are found in the chordata phylum of animals have a dorsal nerve cord at some point in their lives. The dorsal nerve cord is an embryonic feature of chordatas. There are three chordata subphylums: verte... More »