After a volcanic eruption, ecosystems undergo a series of events known as succession. a study done by ecologists on mount st. helens concludes that primary succession occurs when lupines are able to enrich the soil. lupines are a nitrogen-fixing plant well adapted to colonizing sterilized ecosystems. however, the progression of the lupine is slowed by a certain predatory caterpillar. what would be the most successful strategy for ensuring succession in an area where lupines and the caterpillars both colonize? a) introduce a controlled fire to begin secondary succession b) move the caterpillar populations to a different area c) spread lupine seeds to increase the density of growth d) replace the lupines with another type of plant