How do scientists use ice to study ancient climates? through glacial deposits and ice cores through glacial deposits and ice ages through ice cores and pollen grains through pollen grains and ice ages

The scientists use ice to study ancient climates through ice cores and pollen grains.

The thin cores of ice are bored in the ice sheets and stored in specialized freezing rooms for studies. Each year's snow is compressed under the samples of the following years forming glacier ice.

The light bands mean that the snow is fresh due to the moisture that occurs in warm weather.  On the other hand, dark bands refer to winter when the snow is mixed with the dust due to the wind, leading to the change in color of the white snow.

C

Explanation:

the roman republic began to expand when rome fought the punic wars and defeated carthage. the punic wars refer to the series of 3 wars fought among rome and carthage, before it ended in carthage's defeat.