Human activities have led to the accidental introduction of numerous non-native species to isolated marine ecosystems. In a marine biodiversity survey of a heavily trafficked commercial port, marine biologists catalogued a total of 2,135 non-native species. Of these catalogued species, 1,348 were macroalgae, while the remainder consisted of fish, invertebrates, and other marine organisms.
Suggest what is meant by the term non-native species.
Calculate the percentage of these catalogued non-native species that are macroalgae. Give your answer to one decimal place. Show your working.
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.