1. what types of materials are the best conductors? why? 2. what types of materials are the best insulators? why?

1. Metals are the best conductors because their electrons run freely (Copper, gold, silver...) .

2. Nonmetals are insulators because they have a tight hold on their electrons (Glass, plastic, wood...).

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."

c: warm water flows from the western tropical pacific toward south america. that should be the right answer! hope it .