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Suggest some changes in lifestyle that can reduce the risk of some cancers.

What are benign tumour cells?

What are malignant tumours?

How do pathogens produce the symptoms of an infectious disease?

How does the body protect itself from pathogens?

Which cells produce antibodies and what is active immunity?

What is passive immunity?

Why are new antibodies produced for new pathogens?

Explain the process of immunisation (vaccination).

What is the action of antibiotics?