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The word animal comes from the Latin noun animal of the same meaning, which is itself derived from Latin animalis 'having breath or soul'. The biological definition includes all members of the kingdom Animalia. In colloquial usage, the term animal is often used to refer only to nonhuman animals.
- Overview
- The animal kingdom
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Animals are multicellular eukaryotes whose cells are bound together by collagen. Animals dominate human conceptions of life on Earth because of their size, diversity, abundance, and mobility. The presence of muscles and mobility is one of the primary characteristics of the animal kingdom.
What are the two major groups of animals?
The two major groups of animals are vertebrates and invertebrates. Vertebrates have backbones, and invertebrates do not.
When did animals first appear?
Animals first appeared in the Ediacaran Period, about 635 million to 541 million years ago, as soft-bodied forms that left traces of their bodies in shallow-water sediments.
What are the basic functional systems of animals?
Animals evolved from unicellular eukaryotes. The presence of a nuclear membrane in eukaryotes permits separation of the two phases of protein synthesis: transcription (copying) of deoxyribonucleic acid (DNA) in the nucleus and translation (decoding) of the message into protein in the cytoplasm. Compared to the structure of the bacterial cell, this ...
Learn about the kingdom Animalia, which includes all multicellular eukaryotes with muscles and mobility. Explore the diversity, evolution, and characteristics of animals, from sponges to whales, with examples and videos.
Explore the fascinating world of animals with stories, photos, and videos from National Geographic. Learn about wildlife conservation, endangered species, and animal behavior.
Explore the diversity and wonder of animals with pictures, videos, facts, news, and more from National Geographic. Discover the Photo Ark project, the latest animal stories, and the best of National Geographic.
May 26, 2023 · Learn about different types of animals, how they are classified, and where they live. Explore animal habitats, endangered species, and animal news on Active Wild.
Oct 22, 2023 · With thousands more domesticated and wild animal lists planned, our goal is to become the most comprehensive and thoroughly researched animal resource on the planet. Scroll down the page to see a complete list of every animal on A-Z Animals!
Learn about any animal using the search box or browse by letter. Find facts, pictures, definitions, and more for over 10,000 species of animals from around the world.
