A pregnancy starts with fertilization, when a woman's egg joins with a man's sperm<span>. Fertilization usually takes place in a </span>fallopian tube<span> that links an ovary to the </span>uterus<span>. If the fertilized egg successfully travels down the </span>fallopian tube<span> and implants in the</span>uterus<span>, an embryo starts growing.</span>
Stephan is doing a school report on cities with high amounts of air pollution. Which of the following diseases should he focus on in his description of possible effects of air pollution?
