How did Ptolemy's theories contribute to the development of astronomy?
He believed that the Earth was flat.
He believed that the moon's rotation caused ocean tides.
He thenrized that the Earth was moving closer to the sun.
He theorized that the Earth was the center of the universe.

the answer is a, salt plain

the right answer for the question that is being asked and shown above is that: "their policy of "divide and rule" pitted political groups against each other to keep any one group from becoming too powerful.  " the  participant in european imperialism is being described below is that  their policy of "divide and rule" pitted political groups against each other to keep any one group from becoming too powerful.