1 The population density in Parkersburg is 3367% higher than West Virginia. 2  The median age in Parkersburg is 1% higher than West Virginia. 3  In Parkersburg 95.35% of the population is Caucasian. 4  In Parkersburg 1.77% of the population is African American.  In Parkersburg 0.47% of the population is Asian.
The Polychaeta or polychaetes are a paraphyletic class of annelid worms, generally marine. Each body segment has a pair of fleshy protrusions called parapodia that bear many bristles, called chaetae, which are made of chitin. Indeed, polychaetes are sometimes referred to as bristle worms.
The phylum Annelida is composed of invertebrate, segmented worms, and includes about 15,000 species in total.The major evolutionary feature of this phylum is the development of segmented bodies; this segmentation allows for extra flexibility and mobility.he phylum Annelida is composed of invertebrate, segmented worms, and includes about 15,000 species in total.