Jerome has always been an extravert. there is some evidence that people like jerome seek stimulation because their normal brain arousal is relatively low. for example, extraverts exhibit less activity in a frontal lobe area involved in inhibition.

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