Ans: When an ice age is induced on the earth’s surface, there is a huge geographical change on the earth’s crust. The temperature difference caused significant changes in the oceanic currents. The flora and fauna also get affected by the commencement of an ice age. Species that could quickly adapt to such changes survived, and the rest got eliminated. Due to the last ice age, the reptilian dominance on earth ended, resulting in the dominance of human beings.