Answer: behavioral teratogens.
Examples of teratogens are viruses, drugs, chemicals, stressors and even malnutrition. Although teratogens always pose a risk for developing embryos, some do not cause immediate damage. Other factors should also be considered. Factors like the developmental stage the pregnancy, dose, and frequency of exposure, and the genetic makeup of the embryo.
Answer: A
Explanation: A heart attack (myocardial infarction) happens when one or more areas of the heart muscle don't get enough oxygen. This happens when blood flow to the heart muscle is blocked.
D. Filters do not decrease the amount of chemicals that get into a smokers lungs.
