Question

current attempt in progress
nika was born with a physical birth defect in that her left arm was not fully developed. nika found out later in life that her mom smoked cigarettes a lot while she was pregnant with her. provided the nicotine did in fact cause nikas birth defect, then we would say that her birth defect was due to
eugenics.
polygenics.
false immunity.
teratogens.

Explanation:

Teratogens are substances that can cause birth defects. Nicotine is a known teratogen. Eugenics is about improving the human race through selective breeding. Polygenics refers to traits controlled by multiple genes. False immunity is not relevant here.

Answer:

teratogens.