Answer: k12 unit test
Iron filings can provide evidence that can be used to explain how two magnets exert forces on each other because each of the magnets can attract iron filings. Another thing is that the patterns of the iron fillings show lines of force that make the magnet's magnetic field. For example, when a magnet is placed in a container and you place iron fillings over the lid it makes a pattern showing the lines of forces making the magnetic field