How were the civilizations of the huang river valley and the nile river valley similar?

both began around 4000 bce.
both arose in desert regions.
both failed to develop a writing system.
both were ruled by dynasties.

The civilizations of the Huang River valley and the Nile River valley were similar as both were ruled by dynasties. Option D is correct.

A dynasty is understood as a sequence of rulers from the same family, usually in the context of a feudal or monarchical system, but sometimes also appearing in elective republics.  The longest-surviving dynasty in the world is the Imperial House of Japan, otherwise known as the Yamato dynasty, whose reign is traditionally dated to 660 BC.

frederick william of brandenburg-prussia trained his son, frederick, to be a hardy soldier. but frederick disliked rifle shooting and horseback riding. unlike his father, he was interested in french literature. he enjoyed poetry and music and, like some others of the enlightenment, he scoffed at religion. his father thought him soft, frivolous and unmindful of his duties. and when frederick refused to put his signature on a right to succession, for a few moments his father strangled him.

sonar maybe? ? i dont know the choices