I would suggest searching up the guidlines for the science CBA and see what the guidlines say , what they want you to write and have to get above expectations and exceptional. Also look at examples of students who got above expectations or exceptional and see what they did for what they got.. I hope this makes sense, believe me it may help you when you are doing your CBA
1)Impacts of industries on environment
2)Impacts of acid rain on plants/animals
3)should medical cannabis be legal?
4)How do steroids affect our bodies?
7)Are x-rays the best form of diagnostic test for doctor to use?
8)should we rely on pesticides for agriculture?
10)should vaccines be made mandatory?
11)how does gravity affects our daily life?
12)how does temperature affects our environment?
13)effects of eletronic devices on human health
14)does high stress increases you chances of having a stroke?
15)do the benefits of genetic editing overweight the risks?
not very sure if its right or not
But hope it's helpful!