One answer, found in other groups than this one, is to circulate carrier fluid to bring things in to and away from the cells of the interior; flatworms use a simpler but more limiting response. Because a flatworm is flat, even its innermost cells are close to a surface.
Framingham, Massachusetts. Framingham /ËfreÉªmÉªÅËhÃ¦m/ ( listen) is a town in the Commonwealth of Massachusetts in the United States. Incorporated in 1700, it is located within Middlesex County and the MetroWest subregion of the Greater Boston metropolitan area.
Stoneham, Massachusetts. Stoneham is a town in Middlesex County, Massachusetts, nine miles (14.5 km) north of downtown Boston. Its population was 21,437 at the 2010 census, and its proximity to major highways and public transportation offer convenient access to Boston and the North Shore coastal region and beaches of Massachusetts.