Prenatal development is influenced by numerous genetic and environmental factors that can significantly affect the health and development of the fetus. One of the critical periods during prenatal development is the embryonic stage, which occurs between the third and the eighth week of gestation. During this period, fundamental structures and systems are formed, and any disturbances can result in profound developmental issues.

Research indicates that certain teratogens, substances that can cause malformations in a developing fetus, have especially harmful effects during specific developmental stages. For instance, exposure to drugs, alcohol, or environmental toxins can lead to various birth defects and developmental disorders. While the impact of teratogens varies depending on the timing and duration of exposure, scientists emphasize the increased vulnerability of the embryo prior to organ development.

Given this context, which of the following statements most accurately represents the risks associated with teratogen exposure during the embryonic stage of prenatal development?