. . . . "Haeckel, Emst Heinrich Philippaugust" . . "Ernst H\u00E4ckel" . . . . . . . "Ernst Haeckel House" . . . . "Haeckelogony" . . . . . . . "Ernst Haeckel's" . . . . . . . "Haeckel" . . . . "1834" . . . . . . . . . . . "Ernst Heinrich Philipp August Haeckel" . . . . "Haekel" . . . . . . . . . "1919" . "Haeckel, Ernst" . . . . . . . . . . . . "Ernst Haekel" . . . . . . "Haeckel's" . . . . . . . . . . . . . . . . "Ernst Haeckel" . . . . . "1919-08-09" . "Haeckelian" . "Ernst Haeckel" . . . . . . . . . . "human development" . . . . . . . . . . . . . "1834-02-16" . . . . . . . . . . . . . . "Ernst Heinrich Haeckel" . . "Ernst Heinrich Philipp August Haeckel" .