Isabel is researching the effects of deforestation using online sources. She finds an environmental study on the relationship between deforestation and local weather. Which of the following characteristics should this study have in order for its results to be considered valid? I. Empirical observations
II. Evidence that can be replicated
III. Outcomes that don't change with new experimentation

A. I and II
B. II and III
C. I and III
D. I only

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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."

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.