Flatworms also have a feature that the sponges and cnidarians do not, a middle layer of actual organized cells. Flatworms have three cell layers: an ectoderm, an outer covering like the other groups have; an endoderm, a lining of the digestive spaces somewhat like a cnidarians; and a mesoderm between the other two. With actual tissues protected like this, another evolutionary explosion of features happened.
Buying a home in Fredericktown, PA. Fredericktown is a city in Washington County, Pennsylvania. Last year, 2 properties were sold for a median price of $49,000. Average price for a home in Fredericktown, PA is $49,000. The average property tax is $1,186 per year.
Lake Frederick (GNIS FID: 2519270) is a populated place located in Frederick County at latitude 39.043 and longitude -78.162. The elevation is 676 feet. Lake Frederick appears on the Stephens City U.S. Geological Survey Map. Frederick County is in the Eastern Time Zone (UTC -5 hours). Frederick County: Cities & Towns | ZIP Codes | Schools | Features (airports, churches, hospitals, etc.