There are about 15,000 species in this phylum. The phylum includes earthworms, leeches, and marine worms known as polychaetes. Species in this phylum have metameric bodies. Metameric bodies are divided into segments called annuli. The annuli are covered in tiny hairs called setae. Setae help the worms move.
Philadelphia (/ËfÉªlÉËdÉlfi.É/) is the largest city in the Commonwealth of Pennsylvania and the fifth-most populous city in the United States, with an estimated population of 1,567,442 and more than 6 million in the seventh-largest metropolitan statistical area, as of 2015.
The Appalachian Mountains run through the middle of the state. Pennsylvania is the 33rd most extensive, the 6th most populous, and the 9th most densely populated of the 50 United States. The state's four most populous cities are Philadelphia, Pittsburgh, Allentown and Erie. The state capital is Harrisburg. Pennsylvania has 63 miles (101 km) of coastline along Lake Erie and 57 miles (92 km)[5] of shoreline along the Delaware Estuary. The state was one of the 13 original founding states of the U.S.