Animal

Animal

Animals are a major group of multicellular, eukaryotic organisms of the kingdom Animalia or Metazoa. Their body plan eventually becomes fixed as they develop, although some undergo a process of metamorphosis later on in their life. Most animals are motile, meaning they can move spontaneously and independently. All animals are also heterotrophs, meaning they must ingest other organisms or their products for sustenance.

Most known animal phyla appeared in the fossil record as marine species during the Cambrian explosion, about 542 million years ago.

Read more about Animal:  Etymology, Characteristics, Origin and Fossil Record, Model Organisms, History of Classification, Ethics

Famous quotes containing the word animal:

    Man is the only animal that laughs and weeps; for he is the only animal that is struck with the difference between what things are and what they ought to be.
    William Hazlitt (1778–1830)

    Man is the only animal that laughs or weeps; for he is the only animal that is struck with the difference between what things are, and what they ought to be. We weep at what thwarts or exceeds our desires in serious matters; we laugh at what only disappoints our expectations in trifles.
    William Hazlitt (1778–1830)

    Your cravings as a human animal do not become a prayer just because it is God whom you ask to attend to them.
    Dag Hammarskjöld (1905–1961)