Final answer:
The Olmec civilization displayed characteristics like advanced agricultural techniques and an elite ruling class, but they did not build their houses with strong, welded iron.
Step-by-step explanation:
The subject of the question is History. The Olmec civilization was an ancient Mesoamerican civilization that existed from approximately 1200 BCE to 400 BCE. They were known for their advanced agricultural techniques, including the use of raised fields and swamp drainage. They also had an elite ruling class, with powerful priests and rulers overseeing religious and political affairs. However, there is no evidence to suggest that they built their houses with strong, welded iron.
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