Recent studies on the effect of maternal stress on children found that the children of mothers who had experienced abuse during pregnancy had DNA methylation of the genes associated with the hormone .

Cortisol

Cortisol gets a bad rap. It's blamed for anxiety, high blood pressure, stroke. But cortisol also helps control blood pressure, increase the body's metabolism of glucose, and reduces inflammation

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.

answer; i believe the answer is (polygenic inheritance;