Diabetic retinopathy is a medical condition where high blood sugar levels cause damage to the blood vessels of the retina, leading to the death of nearby photoreceptor cells.
Explain how damage to the retina affects a person's ability to see.
The total population of a country is 84.0 million84.0\text{ million}84.0 million, of which 18.5%18.5\%18.5% are over 606060 years of age. Within this older age group, 14.0%14.0\%14.0% develop diabetic retinopathy. Calculate the number of people in this country over the age of 606060 who develop diabetic retinopathy.
26 exam-style questions on Edexcel IGCSE Biology Co-ordination and response. Each one has a worked solution and a mark scheme showing where the marks go.