Darren is a wildlife biologist studying deer and wolf species in a nature reserve. He wants to know what is causing a decrease in the wolf population within the nature reserve. What should Darren do next to find the answer to his question? A. Formulate a question about the wolf and deer populations in the reserve
B. Research causes of wolf population decline within other nature reserves
C. Make a prediction explaining why wolf populations are decreasing
D. Create controlled variables for a wolf population study of the reserve