An atom of argon has three electron shells, all of
which are full. its atomic mass is 40. how many
neutrons does it have?
a. 8
c. 20
e. 24
b. 16
d.22

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."

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint