Aggressive fertility treatments are not responsible for the rise in the incidence of twin births. Rather, this increase can be attributed to the fact that women are waiting longer to become mothers. Statistically, women over 35 are more likely to conceive twins, and these women comprise a greater percentage of women giving birth than ever before.
The argument above is flawed in that it ignores the possibility that
a) many women over 35 who give birth to twins are not first-time mothers
b) women over 35 are not the only women who give birth to twins
c) the correlation between fertility treatments and the increased incidence of multiple births may be a coincidence
d) on average, women over 35 are no more likely to conceive identical twins than other women are
e) women over 35 are more likely to resort to the sorts of fertility treatments that tend to yield twin births
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