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physically (and chemically) I see plastic, metal, rubber and wood as 4 'headings'
Now you need 4 heading down the side to order them in...
yeah i know i need to organize plastic metal rubber wood i didn't get the other order
it is an open ended task (which means no definitive right/wrong answer). you just choose a criteria that you can use to rank them within their categories, then stick to it! how about weight?
but would weight be a chemical or physical property?
weight? physical really, though you could argue chemical. surely it doesn't matter? true chemical is difficult with those items. I think material then weight would be ok. or material and volume/size? honestly, just pick your choice and carry out the organisation to those rules, so long as you explain your table, it is right.