Definition: Given a scientific passage and an answer, generate a question for the given answer.
Input: Passage: After cells differentiate, all the major organs begin to form during the remaining weeks of embryonic development. A few of the developments that occur in the embryo during weeks 4 through 8 are listed in Figure below . As the embryo develops, it also grows in size. By the eighth week of development, the embryo is about 30 millimeters (just over 1 inch) in length. It may also have begun to move. Answer: embryonic
Output:
During which stage of development do all the major organs begin to form?