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Selasa, 22 November 2016
Credit: Thorsten Milse Wildlife Photography The Image Bank Getty
Sabtu, 15 Oktober 2016
Credit: David amp; Micha Sheldon F1online Getty Images
Most known animal phyla appeared in the fossil record as marine species during the Cambrian explosion, about 542 million years ago. Animals can be divided broadly into vertebrates and invertebrates. Vertebrates have a backbone or spine (vertebral column), and amount to less than five percent of all described animal species. They include fish, amphibians, reptiles, birds and mammals. The remaining animals are the invertebrates, which lack a backbone. These include molluscs (clams, oysters, octopuses, squid, snails); arthropods (millipedes, centipedes, insects, spiders, scorpions, crabs, lobsters, shrimp); annelids (earthworms, leeches), cnidarians (jellyfish, sea anemones, corals), and sponges. The study of animals is called zoology.There are some who can live without wild things and some who cannot

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