Why are living organisms contain more hydrogen atoms than any other atoms, yet 65% of a typical organism’s mass is oxygen.

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."

not sure if this is what you'r looking for eubacteria and archaebacteria