A marine biology team collected data from various coastal reefs and found a strong positive correlation between the population density of cleaner wrasse (Labroides dimidiatus, a small fish that feeds on ectoparasites) and the overall biodiversity index of the reef.
Explain why it would not be appropriate to conclude that increasing the population of cleaner wrasse directly causes an increase in reef biodiversity.
Practise AQA A Level Psychology Correlations with exam-style questions for A Level Psychology. 30 questions, matched to the AQA A Level Psychology (7182) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.