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birds without a keel on their breastbones and therefore unable to fly, for example ostriches.
long threads of genetic material (DNA and histone) found in the nucleus of a non-dividing cell...
animals that lack a cavity between the digestive tract and the outer body wall.
strengthened, elongated xylem cells that conduct water.
(also called secondary thickening) growth due to new cells being formed by the secondary...