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Polyesters include a large group of synthetic resins made by the condensation of maleic , phthalic , or other acids with an alcohol or glycol to form an unsaturated polyester . After the resumption of the fighting in 1998 , there were over one million additional internally displaced persons with a total number of approximately two million or equal to one-sixth of the population of Angola . Cybrids are a relic of early experiments with the reproductive technology used by the dragon-born , blending bio-mechanical components with native biodata , usually to produce creatures that can be used as guardians or as transport . Wet grasslands are natural and near-natural ecosystems with a vegetation characterized and dominated by lower growing perennial grasses , sedges , reeds , rushes and / or herbs . Due to gravitational interactions with the disks , the protoplanets swirl rapidly inwards toward their central stars in what scientists call " Type 1 " migration .