How many days after fertilization do the ears begin to develop?

Question

Quizplus · Accepted Answer

The ears begin to develop around day 22 after fertilization. Option A (5) is too early as the embryo is not yet implanted in the uterus at this point. Option B (150) is too late as the ears have fully formed by this time. Option C (10) is also too early as organogenesis is just beginning at this point. Option E (55) is close but still too late as the ears are already forming by day 22. Therefore, the correct answer is D (22).

How Many Days After Fertilization Do the Ears Begin to Develop