Bigger picture thought here - how many unique survival mechanisms exist in floura/fawna/fungi in species that survived from the ice age(s) to today that are onl

Bigger picture thought here - how many unique survival mechanisms exist in floura/fawna/fungi in species that survived from the ice age(s) to today that are only exhibited in extreme temperatures/unique atmospheric conditions. And particularly,how many have we not yet observed/studied due to those conditions not existing currently.