The asteroid impact that caused the extinction of the dinosaurs occurred approximately 66 million years ago, which is long before the formation of the Amazon rainforest. The Amazon rainforest as we know it today, with its rich biodiversity and dense vegetation, has been evolving for the past 10 to 15 million years.
While the asteroid impact did not directly affect the Amazon rainforest, it did have a profound impact on the global climate, which in turn would have affected the evolution of plant and animal life in the Amazon region. The impact caused a massive release of dust and debris into the atmosphere, which would have blocked out the sun's rays and caused a global cooling effect. This would have significantly disrupted the climate and altered the distribution of plant and animal life on Earth, including in the Amazon region.
However, the evolution of the Amazon rainforest is a complex process that has been shaped by many factors over millions of years, including the movement of tectonic plates, changes in sea level, and climate change. The impact of the asteroid that killed the dinosaurs is just one of many factors that have contributed to the evolution of the Amazon rainforest.