In physics a stimulus is a chemical or physical change in an organisms structure (internal or external environment)
Answer:
ALCOHOL.
Explanation:
A teratogen is any agent that causes abnormalities when a developing baby is exposed to it during the mother's pregnancy. They include toxic chemicals, radiation, viruses, alcohol, smoking, certain prescription drugs and other agents.
Exposed of a fetus to alcohol (especially a lot or over a long period of the pregnancy) causes fetal alcohol spectrum disorders (FASD) or fetal alcohol syndrome (FAS). Fetal alcohol syndrome is marked by a pattern of birth defects including: Small head and body size, specific abnormal facial features, learning and behavioral problems.
Since Jamie's child's abnormalities can be traced to teratogen, therefore, the teratogen agent she was most likely abusing was ALCOHOL.
