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Researchers have observed that declines in amphibian populations are more pronounced near cities and towns, and especially in habitats associated with waste water treatment facilities. Could high numbers of women taking birth control pills in these densely populated areas really be responsible for frog population declines?

a. women who take birth control pills
b. wastewater treatment plants
c. male frogs in ponds
d. male frogs that absorb estrogen
e. reduced male fertility

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