Match each symbol with the description that provides the best fit. First, click on a symbol, then click on its corresponding description.

   Congratulations. You have correctly matched the items on an overlay    with the description of that item, without making any incorrect choices.

    You have failed to correctly match the items on an overlay with the     description of that item. You must return to the previous instruction
    and review the material before proceeding.

    You have correctly matched the items on an overlay with the     description of that item, however you did make two incorrect
    choices. You should return to the previous instruction and review the     material before proceeding.

    You have correctly matched the items on an overlay with the     description of that item, however you did make one incorrect choice.     You may want to return to the previous instruction and review the     material before proceeding.