1.  www.bbc.co.uk/schools/gcsebitesize/science/add_aqa/enzymes/enzymes1.shtml

2. www.bbc.co.uk/schools/ks3bitesize/science/biology/diet_intro.shtml

3. www.bbc.co.uk/schools/gcsebitesize/science/aqa/human/dietandexerciseact.shtml

4. www.bbc.co.uk/schools/gcsebitesize/science/aqa/human/dietandexerciserev1.shtml

5. www.bbc.co.uk/apps/ifl/schools/gcsebitesize/science/quizengine?quiz=diet_and_exercisetest;templateStyle=science