Animals

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Animals are multicellular eukaryotic organisms that form the biological kingdom Animalia. With few exceptions, animals consume organic materialbreathe oxygen, are able to move, can reproduce sexually, and grow from a hollow sphere of cells, the blastula, during embryonic development. Over 1.5 million living animal species have been described—of which around 1 million are insects—but it has been estimated there are over 7 million animal species in total. Animals range in length from 8.5 millionths of a metre to 33.6 metres (110 ft) and have complex interactions with each other and their environments, forming intricate food webs. The study of animals is called zoology.

Most living animal species are in the Bilateria, a clade whose members have a bilaterally symmetric body plan. The Bilateria include the protostomes—in which many groups of invertebrates are found, such as nematodesarthropods, and molluscs—and the deuterostomes, containing the echinoderms and chordates (including the vertebrates). Life forms interpreted as early animals were present in the Ediacaran biota of the late Precambrian. Many modern animal phyla became clearly established in the fossil record as marine species during the Cambrian explosion which began around 542 million years ago. 6,331 groups of genes common to all living animals have been identified; these may have arisen from a single common ancestor that lived 650 million years ago.

Test?

KK Kkrajdurai asked on 16 May 2021, 06:51
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AD Admin222 asked on 04 May 2021, 09:51
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Traffic Signs?

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AD Admin222 asked on 04 May 2021, 09:50
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OG Ogogi asked on 29 March 2021, 18:17
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Whatsapp Mesajı Gönder?

Doğru yanıtlar almak için daha fazla ayrıntı eklemeye çalışın. Akışta açıklamanın yalnızca ilk 120 kelimesi görüntülendiğini unutmayın. Birinden addig @ ve kullanıcı adıyla bahsedebilirsiniz , örneğin: @ogogi
OG Ogogi asked on 29 March 2021, 18:17
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MB Mbelgedes asked on 12 December 2020, 14:03
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HO Holiiwii asked on 30 November 2020, 16:11
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HO Holiiwii asked on 30 November 2020, 16:10
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HO Holiiwii asked on 30 November 2020, 16:09
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HO Holiiwii asked on 30 November 2020, 16:02
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