Chemical weathering: changes rocks on a molecular level uses temperature changes to break rocks is always slower than physical weathering transports silt and rock to other places

true

Explanation: chemical weathering means temperature is always changing due to non human contact

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."

amber has allowed scientists to study dna that has been preserved over millions of years.