What is one example of when federal and state laws clashed? A. Desegregation and the Little Rock 9
B. Financial Collapse of 2008
C. The Great Depression

explanation:

may i ask what challenges?

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.

answer; the federal reserve system;

i believe your answer is mountains.