What is teratogenesis concerned with?

Teratogenesis is specifically concerned with the production of fetal deformities. This field of study examines how various factors, including environmental agents like certain chemicals or drugs, can lead to congenital malformations during the development of a fetus. It is an important aspect of developmental biology and medicine, as understanding teratogenic effects can help in assessing risks and preventing birth defects.

The other options do not accurately describe teratogenesis. The development of pesticides relates to agricultural chemistry and pest control, while the creation of new plant varieties pertains to plant breeding techniques. Additionally, discussions about the increase in pest populations focus on population dynamics and pest management strategies, which do not intersect with the study of fetal development and deformities.