Final answer:
During the last Ice Age, sea levels were lower, there were glaciers mainly near the poles, and humans were able to migrate and adapt to the changing climate.
Step-by-step explanation:
The last Ice Age, also known as the Pleistocene Epoch, lasted from about 2.6 million to 11,700 years ago. During this time, there were several significant changes in the Earth's conditions. Sea levels were lower than they are today because a large amount of water was locked up in glaciers. However, glaciers did not cover the entire planet. They were mainly found in regions closer to the poles, and in some areas, they extended as far as present-day New York and Chicago. While some regions experienced extreme cold temperatures, it was not too cold for humans to migrate. In fact, early humans successfully adapted to the changing climate during the last Ice Age and managed to spread to different parts of the world. Although many lakes froze over, not all rivers and lakes were completely frozen during this time as some regions remained relatively ice-free due to geothermal activity.
Learn more about Conditions on Earth during the last Ice Age