blastoderm: the germinal membrane from which the organs of the embryo are formed. Explanation of Terms Used in Entomology John. B. Smith He it was who introduced the terms Keimhaut (blastoderm) and Keimblatt (germ-layer).
Child Study. Child study, also called paidology or experimental pedagogy, was the attempt to apply the methods of modern science to the investigation of children in order to discover the laws of normal child development.
Lesson Summary. Developmental research is a study focused on the progressive changes that occur as an organism develops. It's commonly done by cross-sectional studies, defined as examining samples of the groups the study is interested in, and longitudinal studies, defined as repeated examinations of the same group over a period of time.