Answer:longitudinal design
Explanation: we need to know what is longitudinal design. By definition,
longitudinal design is the study of variables or group of variables which have similar cases and repeated over a long on short period of time. This cases happened between a similar group( teenage girls ), and it happened repeatedly over a long period of time, so this will require a longitudinal design.
A. atom
atoms are described to be the basic unit of a chemical element.
B)landform 2 is what was made by the deposition of sediments
Huh what that’s not an question
