A researcher is recording and moritoring data about a population of plankton-eating fish. When she analyzes the data, she notes a population change that starts at point D . Which is the best prediction to test in an investigation to explain why the population changed at poins D ? a The number of predators in the area has decreased. b. People releosed an invasive species of fish into the ecosstem. 6. Increased wuter clanity caused anincreme in planiton dentity..