Apaleontologist has recovered a bit of organic material from the 400-year-old preserved skin of an extinct dodo. she would like to compare dna from the sample with dna from living birds. the most useful method for initially increasing the amount of dodo dna available for testing is

Polymerase Chain Reaction (PCR)

Explanation:

Polymerase Chain Reaction is a method commonly used to increase or amplify the amount of DNA available in a sample or segment to use it in studies or analyses that require a fair amount of available DNA.

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.