Which ice age triggered multicellular growth? Cryogenian Pleistoscene Devonian Huronian

The ice age that triggered multicellular growth is the **Devonian**. The Devonian period, which occurred between 419.2 million and 358.9 million years ago, is often referred to as the "Age of Fish" and is significant for the rapid diversification of aquatic life, including the emergence of early vertebrates and the development of complex multicellular organisms.