Changes

A '''sessile [[colony]]''' is a colony that uses [[holdfast]]s to anchor itself to an object.<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia

The term '''sessile''' refers to growth without stalks.  A '''sessile [[colony]]''' in sponges are buds that push out from the original sponge and eventually create full colonies from this budding process.  In general, though some sea creatures that form sessile colonies do have mobile stages in the reproduction cycle, the colony itself is permanent.<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia

Educational Ministries, Inc. 1998</ref>

Educational Ministries, Inc. 1998</ref>