I am very sorry, but all I can provide is that Dawn must have used the balance incorrectly or her other classmates didn't account for certain factors that Dawn did. I would really love to help, but I would need more information.
Answer:Primary reinforcers
explanation reinforcers that have innate reinforcing qualities.
The answer is: reversing the current direction will cause the force deflecting the wire to perpendicular to the magnetic field but in the opposite direciton.
Hope this helps!
I would say Nucleic Acids
