A) Compare and Contrast the Early signs and symptoms and late signs and symptoms

1 - Figur out how long the power has been out
2 - Put test subjects in freezer (most likely still colder, give you some more time)
3 - Activate the back up power
4 - Figure out source of the problem and take care of it
5 - Make sure that the backup power has enough charge/gas (backup batteries/generator)