An organism that lives on land gets its oxygen from the . What is the missing word?

answer; /// i believe that the correct answer is (50%);

c.) polymerase chain reaction

- "unlike the original dna fingerprinting method, dna profiling does not use restriction enzymes to cut the dna. instead it uses the polymerase chain reaction (pcr)? to produce many copies of specific str sequences. pcr is an automated procedure that generates lots of copies of a specific sequence of dna."

amber has allowed scientists to study dna that has been preserved over millions of years.