Lily investigates which objects are attracted by a magnet. She tests a paper clip, a crayon, and a nail. She holds a magnet two centimeters away from the object being tested. Each time she tests an item, she uses a different magnet. In what way did she make a mistake setting up her investigation?

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Break down of rocks and minerals into smaller particles without a change in composition is called_

Scientists observed a rock stratum with fossil. if mollusks evolved before arthropod, where will their fossils be found.