According to cell theory, viruses are considered nonliving because they
a)
do not contain organelles.
b)
do not contain organic compounds.
c)
cause diseases in other organisms.
d)
lack the ability to reproduce without a host.

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."

b. the carbon cycle ensures living things have a source of hydrogen