The correct answer is:
biodiversity is reduced
During ice age, the temperature throughout the entire earth is really low. This created an environment in which only a few organisms could survive in it (no tropical and animal plants could exist), which lea to the reduction of Biodiversity on the Earth.
Step-by-step explanation:
An ice age is a period of long-term reduction in the temperature of Earth's surface and atmosphere, occurring in the presence or development of continental and polar ice sheets and alpine glaciers.
An ice age is a period of colder global temperatures that highlights recurring glacial development across the Earth's surface. Expert of lasting hundreds of millions of years, these periods are distributed with normal warmer interglacial interludes in which at least one major ice sheet is present.