According to cell theory, viruses are considered nonliving because they

They are not made up of living cells.

viruses can’t reproduce or replicate themselves on their own and need a host cell. They don’t grow and can’t make their own energy

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."