According to the graph,at what maternal age does the incidence of Down syndrome begin to increase substantially?

Name: According to the graph,at what maternal age does the incidence of Down syndrome begin to increase substantially?
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The graph shows a gradual increase in the incidence of Down syndrome with maternal age, but the increase becomes steeper around age 35 and continues to rise sharply after age 40. Therefore, the best choice is D, which includes the ages of about 37 or 38.

According to the Graph,at What Maternal Age Does the Incidence