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*[[Closed System]] - In a [[Closed System|closed system]] [[mass]] cannot get in or out, but energy can. In these [[system]]s the law of [[Conservation of Mass]] can be [[observed]] but the law of [[Conservation of Energy]] cannot.
*[[Closed Isolated System]] - In a [[Closed Isolated System|closed isolated system]] neither [[mass]] nor [[energy]] can get in or out. In these [[system]]s both the laws of [[Conservation of Energy]] and [[Conservation of Mass]] can be [[observed]].
[https://www.amazon.co.uk/gp/product/1782945598/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945598&linkCode=as2&tag=nrjc-21&linkId=ad276ad49df77ab4b40ab4fd0fe10045 ''‘lock and key’ model, page 25, GCSE Combined Science; The Revision Guide, CGP, AQA']
[https://www.amazon.co.uk/gp/product/1782945563/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945563&linkCode=as2&tag=nrjc-21&linkId=9a1d023a374038e6072f33c4f3cf808b ''‘lock and key’ model, page 28, GCSE Biology; The Revision Guide, CGP, AQA']
[https://www.amazon.co.uk/gp/product/1782945563/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945563&linkCode=as2&tag=nrjc-21&linkId=9a1d023a374038e6072f33c4f3cf808b ''“induced fit” model, page 28, GCSE Biology; The Revision Guide, CGP, AQA']
[https://www.amazon.co.uk/gp/product/0008158754/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158754&linkCode=as2&tag=nrjc-21&linkId=27ad53b0283feeff7fc5ae04a9e205f2 ''Abiotic factor, pages 232, 326-7, GCSE Biology; Student Book, Collins, AQA']
[https://www.amazon.co.uk/gp/product/1782945563/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945563&linkCode=as2&tag=nrjc-21&linkId=9a1d023a374038e6072f33c4f3cf808b ''Abiotic factors, page 107, GCSE Biology; The Revision Guide, CGP, AQA']
[https://www.amazon.co.uk/gp/product/1782945598/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945598&linkCode=as2&tag=nrjc-21&linkId=ad276ad49df77ab4b40ab4fd0fe09650 ''Abiotic factors, page 84, GCSE Combined Science; The Revision Guide, CGP, AQA']
[https://www.amazon.co.uk/gp/product/0008158770/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158770&linkCode=as2&tag=nrjc-21&linkId=ec31595e720e1529e49876c3866fff6e ''ABS (anti-lock braking system), page 154, GCSE Physics; Student Book, Collins, AQA']
[https://www.amazon.co.uk/gp/product/0008158754/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158754&linkCode=as2&tag=nrjc-21&linkId=27ad53b0283feeff7fc5ae04a9e205f3 ''Absorption, pages 100-1, GCSE Biology; Student Book, Collins, AQA']
[https://www.amazon.co.uk/gp/product/0008158770/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158770&linkCode=as2&tag=nrjc-21&linkId=ec31595e720e1529e49876c3866fff6e ''Absorption; lines, page 111, GCSE Physics; Student Book, Collins, AQA']
[https://www.amazon.co.uk/gp/product/0008158770/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158770&linkCode=as2&tag=nrjc-21&linkId=ec31595e720e1529e49876c3866fff6e ''Absorption; of wave energy, pages 202, 226-7, 232, 234-5, GCSE Physics; Student Book, Collins, AQA']
[https://www.amazon.co.uk/gp/product/1782945598/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945598&linkCode=as2&tag=nrjc-21&linkId=ad276ad49df77ab4b40ab4fd0fe09651 ''Abstinence, page 65, GCSE Combined Science; The Revision Guide, CGP, AQA']