Human beings belong to the primate order, which is in the mammalia class. Other members of the primate order include gorillas, apes and lemurs. More »

Humans belong to the phylum Chordata. Humans are part of this phylum, because they have a notochord when they are in the womb; this notochord will eventually turn into a spinal cord. More »

Humans are in the Hominidae family in Linnaean classification. Members of this family are called hominids. Orangutans, gorillas, chimpanzees and bonobos, considered the great apes, are also members of the Hominidae famil... More »

A natural ecosystem is an ecosystem that occurs as it would without the influence of human beings. The term “ecosystem” refers to all of the plants, animals, fungi, protozoans, bacteria and other organisms that live in t... More »

Human beings require air because, like all other animals, they are aerobic organisms who require oxygen, which is a component of air. While oxygen is found in water, humans evolved to extract the oxygen from air, as bird... More »

Water is an end product of aerobic respiration in living beings. The process of cellular respiration, occurring in the presence of oxygen, extracts energy from ingested foods by converting them to carbon dioxide and wate... More »

Multicellular organisms may evolve into large and complex beings, but they all begin as a single cell and pass through several defined stages of development. All beings, from small plants and insects to large elephants, ... More »