The reading states that around 15 million years ago, Antarctica was warmer and it supported much richer ecosystems and provides three arguments of support. However, the professor states that this is unconvincing and refutes each of the authors' arguments. First, the reading states that pollen grains from two types of trees dating to 15 million years ago have been found on the coast of Antarctica. The professor opposes this point by saying the pollen grains might not come from Antarctica. The professor states that pollen grains are very light, so they can be carried to thousands of kilometers. The professor adds that the pollen grains might be carried by ocean water or they might be carried by the air movement from the South America and