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.
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Carrolltown, Pennsylvania. Carrolltown is a borough in Cambria County, Pennsylvania, United States. The population was 853 at the 2010 census, down from 1,049 at the 2000 census. It is part of the Johnstown, Pennsylvania Metropolitan Statistical Area. Contents.