[Free Registration/Login Required] A three-lesson unit on cause and effect where students learn signal words to identify cause and effect relationships and then examine those relationships in historical fiction with Pink and Say by Patricia Polacco, and in myth with Why Mosquitoes Buzz in People's Ears: A West African Tale by Verna Aardema. With free login, users have access to the passage "Dear, Mr. President" used in the first lesson in this unit as well as other learning materials.