An accidental leakage from a dairy processing facility results in a large volume of milk being discharged into a nearby freshwater stream.
Identify the primary carbohydrate (sugar) present in milk that acts as the main organic substrate for microbial growth.
Explain the biological consequences of this organic pollutant entering the stream ecosystem.
44 exam-style questions on Edexcel IGCSE Biology Human influences on the environment. Each one has a worked solution and a mark scheme showing where the marks go.