Macular degeneration is an eye condition where the central part of the retina, called the macula, becomes damaged.
Explain how damage to the retina affects the ability to see.
The total population of a country is 65.0 million65.0\text{ million}65.0 million, of which 38.0% are over 50 years of age. Within this older age group, 12.5% of the people develop macular degeneration. Calculate the number of people in this country over the age of 50 who develop macular degeneration.
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.