Why is sanitation important in cities

Better urban sanitation unquestionably contributes to environmental protection, through a reduction in pollution of soils, waterways and groundwater. It also helps to mitigate the adverse impacts of flooding exacerbated by climate change

1) d

2)c

3)b

4) a

5)c

6) c

explanation:

allergens: overstimulate the nerve system

neurotics: attack nerve cells

mutagens: damage or otherwise alter dna sequence

generators: cause defects during growth and development  

carcinogens: cause unchecked cell growth

i hope you get the idea according to me these are the effects that happened.