What do these two changes have in common? using a large magnet to remove pieces of iron from a junkyard
picking up a paper clip with a magnet

Both are only physical changes.

explanation:

crosscutting concepts have application across all domains of science. as such, they are a way of linking the different domains of science. they include patterns; cause and effect; scale, proportion, and quantity; systems and system models; energy and matter; structure and function; and stability and change.

it’s previous models   because when i picked that son of a gun’s answer it was wrong look for previous models because they might make it a different letter