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.
Annelida â This group is probably the most recognized of the three worm classifications. Phylum Annelida includes some sea worms, but it is mostly comprised of segmented worms such as earthworms. Earthworms are also an unofficial broad classification of worms. Hundreds of different worm species in 16 families are considered earthworms. Earthworms are also divided into three subcategories depending on their ecosystem.