Final answer:
In ancient Egypt, royal families often practiced incestuous marriages to keep their bloodline pure, believing themselves to be gods, which is true.
Step-by-step explanation:
The statement that some communities in ancient Egypt entered into incestuous marriages to maintain their cultural identity is true. This practice was notably present within the royal family, where incestuous marriages were conducted to keep the bloodline pure, as they believed themselves to be gods not wanting to dilute their sacred lineage with that of commoners. This led to a series of health issues due to inbreeding. However, this practice was not widespread among the general populace of ancient Egypt, and the state was largely run by a robust bureaucracy outside the royal family, making the state less susceptible to the detriments of royal inbreeding.