Explain why all models hmodels need to be changed when
a.
they are based on experimental data
b.
scientific understanding changes
c.
they represent a phenomenon
d.
they are designed to answer a question
ave limitations

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."

the answer is d. chordata