What is characterized by the presence of Pangea and multiple ice ages?

The correct choice is the Paleozoic era. This era, which lasted from approximately 541 million to 252 million years ago, is characterized by significant geological and biological developments, including the formation of the supercontinent Pangea and multiple ice ages. During the Paleozoic, the continents were pulled together to form Pangea, which played an important role in the climate and environment of the time. Additionally, significant glaciation events occurred during the late Paleozoic, particularly in the Carboniferous and Permian periods, which are marked by extensive ice sheets in the southern hemisphere.

In contrast, the Mesozoic era is known for the age of dinosaurs and the breakup of Pangea, while the Cenozoic era, which follows the Mesozoic, is characterized by the development of mammals and birds. The Archean era, much earlier in Earth's history, primarily involves the formation of the Earth's crust and the beginning of life, lacking the characteristics highlighted in this question.