The greatest decline on record in the moose population occurred in 1996 and 1997. Was the limiting factor that probably caused the decline density dependent or density independent?

Trees with light brown bark dominate an ecosystem the ecosystem has populations of insects that thrive on the tree bark over time some insect species developed certain physical characteristics that them thrive on the tree bark these physical characteristics also the insects defend themselves from predators which insect species is probaly the species with the new physical characteristics?