Final answer:
The primary blows to the preservation of Rapa Nui culture were ecocide, population decimation by European diseases, and blackbirding.
Step-by-step explanation:
The preservation of Rapa Nui culture was primarily impacted by ecocide, population decimation by European diseases, and blackbirding. Ecocide refers to the destruction of the island's natural resources, which led to difficulties for the people of Rapa Nui, including deforestation and resource scarcity. The introduction of European diseases greatly reduced the population, and blackbirding, or the forced recruitment of islanders for labor, also had a negative impact on the culture.