Exposure to what most likely affected cell diffrerentiation in the growing embryo?

Exposure to various environmental factors, such as chemicals, hormones, and nutrients, significantly affects cell differentiation in a growing embryo. Teratogens, for example, can disrupt normal developmental processes, leading to abnormal differentiation and potential birth defects. Additionally, signaling molecules and growth factors play critical roles in guiding stem cells to differentiate into specific cell types during embryonic development.