What is the independent variable (cause) is this experiment? "Which type of medium (soil or sand) is best for plant growth?"

Question 6 options:

type of medium (soil or sand)

height of plant

types of plant

amount of medium (soil or sand)

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."