Sadly, Mary experiences a smaller than normal head, heart defects, intellectual disorder, learning difficulties, and delayed growth. If these defects can be traced to a teratogen used by her mother during pregnancy, which was she most likely abusing?

alcohol

Explanation:

Teratogens are substances or agents associated with malformation of embryo, that can contribute to birth defects such as smaller head than normal, heart defects, intellectual disorder, learning difficulties, and delayed growth. This substances or agent or factors includes the following; some maternal diseases, pollutants, drugs and alcohol.

Hence, it can be concluded that Mary's mother abused alcohol during the time she was carrying Mary's pregnancy

they all focused on themes about the inevitability of death.