Why did tzar nicholas ii abdicate the russian throne?
a) lenin forced his execution
b) he refused to enter world war i
c) his troops mutinied in the capital
d) stalingrad was surrounded by german forces

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.