Question 60 epidemiological studies can generally be conducted very quickly, making them useful for testing new chemicals before their release to the market. a) true b) false question 61 some studies have shown that exposure of human babies to the group of hormonally active agents called male infertility may correspond with early puberty in girls and question 62 the chemical pesticide ddt is persistent, or resistant to breakdown, and can be biologically magnified. a) true b) false question 63 the cancer incidence dropped in the period of 1990 to 1995 a) true b) false question 64 improper diet represents one of the highest risks associated with cancer, a) true b) false