The Aztecs, Olmec, and Mayan in Mexico and the Inca and Peruvians in South America. Also ancient and unknown groups in Europe and the Mississippi valley, as well as an ancient Chinese group in Xian China. There are also pyramids in the desert of Sudan as well as a top secret, large, ancient, and mysterious buried black pyramid in the Alaskan wilderness north west of Mt. Denali. And there are a few other random groupings of pyramids spread throughout the world. Pyramids are a great mystery.
Pyramids were primarily built by ancient Egyptian and Mesoamerican civilizations for religious and ceremonial purposes. Other religious groups, such as the Mayans and Aztecs, also built pyramids, but the design and significance of these structures varied between cultures.
The Egyptians built pyramids as the tombs of their kings.
The ancient Egyptians built the pyramids for pharaohs in the afterlife.
The Egyptians built the pyramids as buril places for the pharoahs.
No. The pyramids were built by real people - the Egyptians.
because they believed in afterlife so they built the pyramids to put the dead kings in to keep them safe. In terms of grammar, both are acceptable. However, I would recommend using "Egyptians built pyramids" because implicit in the usage of the present perfect (the "have done something" tense) is that the action has continued to the present, which is not the case as concerns Egyptians building pyramids.
pyramids
Built pyramids.
No they were built by the Egyptians
The Egyptians.
No, they built pyramids
Over ramids were built by the Egyptians.