Why are paper clips attracted to magnets ? A. They contain silver
B. They contain aluminum
C. They contain Tin
D. They contain iron

  D

Explanation: Paper clips are attracted to magnets because they contain iron.

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Paperclips are generally made of steel, a major component of which is iron. Iron is a ferromagnetic material — in other words, it becomes a magnet when in the presence of an external magnetic field. So when you bring a magnet close to a paperclip, the iron in the paperclip becomes magnetized, and they leap together!

Explanation: brainliest please? I am working hard to get to the next rank and I just need a few more things please!

the dna molecules have a negative charge because of the phosphate groups in their sugar-phosphate backbone, so they start moving through the matrix of the gel towards the positive pole. power is turned on and dna fragments migrate through gel (towards the positive electrode).

explanation: