The true statements about the Mayan, Incan, and Aztec civilizations are:
- They were advanced in mathematics and astronomy.
- They built magnificent cities and stone temples.
The other statements regarding their cultures centering around fishing and being peaceful with neighboring tribes are not accurate. The Mayans, Incans, and Aztecs did engage in fishing in some contexts, but their cultures were much broader and included agriculture and various forms of trade. Additionally, these civilizations often engaged in warfare and conquest, making the statement about being peaceful generally inaccurate.