What do these two changes have in common? bleaching clothes building a tower out of magnetic blocks Select all that apply. Both conserve mass. Both are changes of state. Both are caused by cooling. Both are caused by heating

## Step 1<br />The problem presents two different scenarios: bleaching clothes and building a tower out of magnetic blocks. We are asked to identify the commonality between these two changes.<br /><br />## Step 2<br />The first scenario, bleaching clothes, involves a chemical change. This is because the bleach reacts with the stains on the clothes, altering their molecular structure. This process does not involve a change of state, nor is it caused by cooling or heating.<br /><br />## Step 3<br />The second scenario, building a tower out of magnetic blocks, involves a physical change. This is because the blocks are simply being rearranged, not altering their molecular structure. This process also does not involve a change of state, nor is it caused by cooling or heating.<br /><br />## Step 4<br />Given these explanations, the only commonality between these two changes is that both conserve mass. This is because neither process involves the creation or destruction of matter, but rather the rearrangement of existing matter.