1. Scientists are able to conclude that a forested ecosystem existed in Antarctica millions of years ago by studying

Scientists are able to conclude that a forested ecosystem existed in Antarctica millions of years ago by studying fossilized plant remains and pollen grains found in sediment cores extracted from the Antarctic ice sheet. These fossilized plant remains and pollen grains provide evidence of past vegetation and climate conditions in the region. Additionally, studies of ancient ice cores have revealed that Antarctica was once much warmer than it is today, with temperatures that would have supported forest growth. This evidence, combined with the presence of fossilized plant remains and pollen grains, suggests that a forested ecosystem existed in Antarctica millions of years ago.