Your friend has dropped some iron nails into a container of sand .She is asking you to help her separate them. • Which separation technique would you advise her to use and why?
• What will you need to carry out this separation .

the answer is:  

line graphs show patterns in data with variables that change over time; whereas, circle graphs show data as parts out of a whole (such as out of 100%).

the dissolution of polymer can be thermodynamically described in 2 steps.