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Structure , structure, social structure A term loosely applied to any recurring pattern of social behaviour; or, more specifically, to the ordered interrelations… material , ma·te·ri·al / məˈti(ə)rēəl/ • n. 1. the matter from which a thing is or can be made: goats can eat more or less any plant material | materials such a… Origin , or·i·gin / ˈôrəjən/ • n. 1. the beginning of something's existence: a novel theory about the origin of oil the name is Norse in origin. ∎ a person's… Periderm , periderm The thin, sheet-like material that makes up the skeleton in graptolites (Graptolithina). Long thought to be chitin, it is now considered per… centre of origin , centre of origin The region where a particular group of organisms is believed to have originated. Many authorities believe centres of origin are also… Columella , columella
1. In corals, a rod-like structure formed from the swollen axial end of the counter-septum that may occur as a central structure within the…
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