Which of the following is true concerning the earth's geologic plates? a. they move b. they are affected by the earth's weather c. they are affected by climate change d. they don't move

What does polymerase chain reaction (pcr) do? o a. separates dna fragments by size o b. cuts a dna sample into fragments o c. provides an overall picture of a person's chromosomes o d. makes more copies of a sample of dna