There’s nicotine in tobacco
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<span>D is the correct answer. Controllable risk factors are factors you have control over, for example environmental or behavioural. These are such things as sexual behaviour and smoking. Her age and heredity are examples of uncontrollable risk factors, as a person cannot determine these.</span>
The procedure is a refraction or vision test. The doctor may use a computerized refractor or simply shine a light into your eyes.