What was a common theme shared by the Mayan and Aztec civilizations?

Responses

They were both interested in astronomy.
They were both interested in astronomy.

They shared similar marriage customs.
They shared similar marriage customs.

They traded fur with the Dutch and French.
They traded fur with the Dutch and French.

They were nomadic and traveled in clans.

They were nomadic and traveled in clans.

They were both interested in astronomy.