Question Detail
Question
Which of the following events is not correct with the time span associated with it in a normal human fetus?
Correct Answer
Option D is the correct answer.
Detailed Explanation
All the statements are generally correct for human embryonic/fetal development. The heart begins beating around week 4. Limb buds appear and bones begin forming by week 8. External genitalia develop and sex becomes evident by week 10-12. Therefore, 'none of the above' is correct.
Hint
Check each statement against standard embryology timelines.