Life has unbelievably complex and diverse strategies to ensure survival. Organisms are able to go dormant during unfavorable conditions, and resuscitate once the environment becomes ideal again. This can play out over relatively short time periods such as when animals hibernate, or over longer periods where organisms can go into stasis, e.g. reviving bacteria from 250 million year old salt crystals.
Researchers in Russia recently thawed out permafrost sediment frozen for the past 42,000 years, and revealed once frozen and now living nematodes. Yes you heard that correctly, worms birthed and subsequently frozen during the Pleistocene (42,000 years earlier) were just resurrected in the 21st century. Frankenstein, eat your heart out.