Animals
The dog and cat that run around the house are just two of a wide variety of animal types, including humans. Officially animals are part of the Kingdom Animalia. They have several unique traits that distinguish them from other living organisms. They are usually multicellular, with cells that have specific jobs to perform. They are … Keep Reading → heterotrophic, which means that they depend on other organisms for food. They are generally capable of voluntarily movement. They have senses which are able to respond to stimuli. Animals are divided into numerous categories based on additional characteristics. Examples include mammals, birds, fish, and insects. Animals are believed to have formed on the planet over 500 million years ago. Aristotle was the first to make the distinction between animals and other living organisms such as plants. His work seems simplistic today, but at the time it was groundbreaking.
