Food kept in refrigerator stays fresh much longer but once the food is taken out , it again spoils after some time from this we can conclude that _.

Explanation:

Bacteria become inactive when subdue into low temperature still remains alive

but once brougth out to a warmer environment, they become active and become to act on the food.

her next move would be to use agarose gel electrophoresis to separate the dna molecules of varying length and create a dna fingerprint.