When discussing magnetic fields we could say that metals can become magnetic if they have many spinning electrons that create magnetic fields
O metals are magnets because they have more electrons than non-magnetic materials
O non-paired electrons spin in opposite directions creating a magnetic field
the spinning electrons in some atoms pair up and create a magnetic field

Explanation:

metal can become magnetic if they have many spinning electron. When the majority of atoms spin in the same direction the strong magnetic field is produced the direction of electron spin determine the direction of magnetic field

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."

i dont know it at allnow im just getting points at this pint