Pollution
Although there is not too much to it, you need to know its intricacies. You need to know key terms l;ike fossil fuels and O-Zone layer.
Enzymes
OMG! These are easy. Only if you revise though. No work and you expect the reward? That isn't how it works my friend. You need to know the loction of where enzymes are produced, their names, what they digest.
Carbon cycle
The examiners love this so if you don't revisie for it, expect a bad grade. It only requires you to look at a chart and see when an animal dies, where does it go. Continuing from the animal theme, You also need to know how animals lose energy
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