Final answer:
The risk for the formation of abnormalities is relatively low during the first two weeks of the embryonic period due to the fragility of early embryos and the minor changes in genes that are important to embryonic development.
Step-by-step explanation:
The risk for the formation of abnormalities is relatively low during the first two weeks of the embryonic period due to the fragility of early embryos and the minor changes in genes that are important to embryonic development. Early embryos are extremely delicate, and even small mutations can cause death. Therefore, the body prioritizes the survival of the embryo by minimizing the risk of abnormalities during this critical period.