Final answer:
True, between 10-15% of pregnancies result in miscarriage. Miscarriages often occur in the first trimester and can be influenced by factors like maternal age and fetal abnormalities such as Trisomy 21.
Step-by-step explanation:
The statement that at least 10-15% of pregnancies end in miscarriage is true. Miscarriages are a type of spontaneous termination of a pregnancy and typically occur early in the pregnancy, often within the first trimester. A miscarriage happens when the fetus cannot develop properly, leading to a natural end to the gestation. Factors such as maternal age can influence the risk of miscarriage, with higher risks associated with older maternal age. Additionally, pregnancies with certain abnormalities, such as trisomies, are more likely to result in miscarriage. Trisomy 21, also known as Down syndrome, is the most common trisomy in humans and more frequent in pregnancies of older women. However, many of these cases result in miscarriages, which contributes to the overall miscarriage rate.