Which of these spanish-speaking countries uses the u. s. dollar as their currency? a) venezuela, cuba, spain, dominican republic. b) ecuador, el salvador, panamá, puerto rico. c) méxico, perú, nicaragua, el salvador. d) bolivia, colombia, argentina, paraguay

answer; /// i believe that the correct answer is (a) making presentations;

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.