Final answer:
The statement regarding congenital heart disease anomalies occurring in utero during weeks 15 through 20 is False, as heart development occurs predominantly between days 18 and the end of the eighth week.
Step-by-step explanation:
The statement that congenital heart disease is associated with anomalies of the heart structure occurring in utero during weeks 15 through 20 is False. The critical period for heart development in the embryo actually takes place considerably earlier. The heart begins to form around day 18 or 19 from the mesoderm and starts beating and pumping blood around day 21 or 22. The primitive heart tube folds within the pericardium to form an S shape from days 23 to 28, placing the chambers and major vessels into an alignment similar to the adult heart.
The formation of septa and valves as well as the remodeling of chambers occurs by the end of the eighth week, with the atrioventricular valves forming between weeks five and eight, and the semilunar valves between weeks five and nine.