Technically, they can but you don't have to be related because you can have things in common with another person with are personality traits , and if they have different skin colors it doesn't matter , and you can still have many traits in common , because my sister is darker than me a lot but we still share same traits.
Answer:
The horizontal rows/lines on the periodic table are called periods.
Explanation:
C is your answer :)
And also C and D are true but its C.
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