James is a scientist who is working on finding an answer to a question about solar eclipses; however, he doesn’t have enough time or data to test all the possible answers to his question. Based on this, James is using specific studies and calculations in an effort to find answers that are close to, or an approximation of, a correct answer. What are these approximation answers that James is looking for called? intervals astrometry estimation clusters

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."

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.