20. Which one of the following statements about the Commonwealth is correct? A. The headquarters are in Sydney. B. The USA president is the head of the organisation C. Heads of states meetings are held annually. D. The members mostly use the English language.

answer; ok in rural area most people depend on private transportation(cars),pick up truck,donkey and buggy: ),and urban people can walk or ride public transportation,bus,train cab,uber.

answer; john stuart mill's principle of utility is your answer; /// good luck

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.