Assalamualaikum dan salam sejahtera kpd sume pembace
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Sipnosis tuk chapter ni:
Only concepts and facts
- Natural cycle (carbon cycle, water cycle, oxygen cycle and nirogen cycle)
- Food chain and food web
- Effect of natural disaster on the nature
- Environmental pollution and its effect [Edited on 15 April 2010, 7:03 A.M]
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