Answer:
If one side of the train is positive and the other is negative they will attract if they are the same then they will repel.
Explanation:
If both are positive they will repel if both are negative they will repel and if they are opposites they will attract.
There are 6 types of quarks.
Answer: C. 6
Answer:
Positive ions, or cations.
I think it’s contact I’m not sure