In 1921, Sanger founded the American Birth Control League, which later became the Planned Parenthood Federation of America. In New York City, she organized the first birth control clinic staffed by all-female doctors, as well as a clinic in Harlem with an entirely African-American staff.
Cephalization is considered an evolutionary trend, whereby nervous tissue, over many generations, becomes concentrated toward one end of an organism. This process eventually produces a head region with sensory organs.Cephalization is intrinsically connected with a change in symmetry.It accompanied the move to bilateral symmetry made in flatworms, with ocelli and pinnae placed in the head region.his process eventually produces a head region with sensory organs. Cephalization is intrinsically connected with a change in symmetry. It accompanied the move to bilateral symmetry made in flatworms, with ocelli and pinnae placed in the head region.
Cephalopods (Cephalopoda) are a group of mollusks that include 3,300 living species. Members of this group include the octopuses, cuttlefish, squid and nautiluses. Cephalopods are exclusively marine animals.They include the largest, most intelligent and most mobile of all mollusks.art of the mantle of a cephalopod forms a siphon through which water is forced. As the water pressure moves through the siphon, it forces the cephalopod forward and in this way produces jet propulsion. Cephalopods also use their tentacles to move and help maintain their velocity.