An intrauterine device works to prevent pregnancy by _____

a. changing the pH of the uterus so sperm cannot live
b. changing the chemistry of the uterus so sperm cannot live
c. interfering with sperm movement or implantation
d. killing sperm
e. preventing ovulation


ANSWER: c

Biology & Microbiology

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When light excites chlorophyll, the chlorophyll

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The atomic number is determined by the number of ____.?

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Biology & Microbiology