Down Syndrome common disorder effects approximately 1 in 1000 newborns (particularly in older expectant mothers), results when an extra copy of genes occurs on chromosome 21. babies affected  show that decreased muscle tone in the face, developmental delays, and heart and digestive system defects. there is not no treatment for it right now

Air pollution is case from harmful chemicals in the air. It can make it harder to breathe. it is treatable if you get away from it in time  

Cancer is cause by lifestyle cause and genetics cause it can be in your genes. They will have to go through intense theropy

genetics means that it is in your DNA

environment is from nature or your surroundings

lifestyle is when your choices in life affects your health