check my answer: The biome that comprises most of Antarctica is the polar desert biome, characterized by extremely cold temperatures, low precipitation, and little vegetation. Antarctica is described as being part of this biome because it has similar environmental conditions and minimal plant and animal life due to the harsh climate.

Looks good! Antarctica is indeed primarily made up of the polar desert biome, as it fits the description of having extreme cold, low precipitation, and limited vegetation and wildlife. Well done!