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www.reference.com/article/said-man-nature-political-animal-e8a046bc1c987161

The Greek philosopher Aristotle, who lived from 384 to 322 B.C., said, "Man is by nature a political animal." These words are part of his "A Treatise on Government."

www.reference.com/world-view/nature-personality-baaf0f5615038723

Personality is the term given to the attributes people take on that are attributed to personal life experience. Personality traits heavily influence the way individuals interact with the world and increases or decreases their chance at success in life.

www.reference.com/article/bird-animal-7cae95379de2f11e

Birds are in the Animalia kingdom, making them animals. Birds are a member of the phylum Chordata and the subphylum Vertebrata, which means they have vertebrae, and they are in the class Aves.

www.reference.com/article/definition-natural-number-4667647fc25edb40

A natural number is the sort of number that is commonly used for counting or basic arithmetic. They are positive whole numbers, such as one, two or three, and are used to denote quantities in everyday life.

www.reference.com/article/u-s-naturalization-number-e2e581b537462e7b

A naturalization number refers to a C-File number, which refers to the certificate file number printed in red on a U.S. Certificate of Naturalization. C-File numbers have been provided since 1906, according to the U.S. Citizenship and Immigration Services website.

www.reference.com/science/natural-system-8b09d86e41c418ee

In the field of ecology, a natural system is one that exists in nature, independent of any human involvement. The natural system consists of all the physical and biological materials and their intertwined processes

www.reference.com/article/fish-animal-3a7dea02039d3201

A fish is an animal. It is a multicellular organism with eukaryotic cells arranged into tissues and organs. Eukaryotic means that fish cells have nuclei and other structures that are protected by membranes.

www.reference.com/article/insects-animals-af19a692ccc9e825

Insects are classified as animals. Organisms on Earth fall into one of two categories: plants or animals. The animal kingdom is quite diverse and includes arthropods, which is a family comprised primarily of insects.

www.reference.com/science/types-natural-environments-867bfa85e5396ec2

There are many different types of environments, also called habitats, in which organisms live, including forests, grasslands, coastal areas and marine environments. Large and small organisms live in diverse habitats around the world. Some habitats are characterized by harsh conditions and extreme te

www.reference.com/article/animal-hunts-other-animals-d285647202a78803

An animal that hunts other animals for food is called a carnivore or predator. These animals must kill other smaller animals to feed. Since carnivores must hunt to survive, they use large amounts of energy to obtain their food, and thus they require many calories to stay healthy.