Final answer:
At 11 weeks of gestation, an embryo, now referred to as a fetus, is the size of a lime, showing significant development compared to earlier weeks when it was the size of a kidney bean at nine weeks.
Step-by-step explanation:
After 11 weeks, the embryo is approximately the size of a lime, measuring between 1.5 to 2.5 inches in length. This is a significant growth from earlier weeks, as by the end of the seventh week, the embryo is only about 13 mm (0.51 in.), and by the eighth week, about 20 mm (0.79 in.). It already has visible developments like limb buds and tail. By the eleventh week, the embryo has continued to grow and is comparable in size to a lime.
During this period, there is a transition from the embryonic stage to the fetal period, and the embryo starts to take on more distinct human characteristics. Moreover, the organs continue to develop, and facial features become more defined. The term fetus is used after the ninth week, and this is when the embryo is approximately the size of a kidney bean. By the time the fetus reaches 11 weeks, it has undergone considerable growth and developmental changes, indicating rapid development within the womb.