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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… Runner , run·ner / ˈrənər/ • n. 1. a person who runs, esp. in a specified way: a fast runner. ∎ a person who runs competitively as a sport or hobby: a maratho… Pectoral Girdle , pectoral girdle (shoulder girdle) The bony or cartilaginous structure in vertebrates to which the anterior limbs (pectoral fins, forelegs, or arms) a… Structure , structure, social structure A term loosely applied to any recurring pattern of social behaviour; or, more specifically, to the ordered interrelations… Seed Ferns , Pteridospermales (seed ferns) Extinct gymnosperm order, which were the earliest seed plants and flourished in the Carboniferous, before disappearing… diaspore , diaspore An aluminium hydrate α-AlO(OH), forming a continuous series with its polymorph boehmite γ-AlO(OH); sp. gr. 3.3–3.5; hardness 6.5–7.0; white;…
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