Density control on a butterfly population.

Density control on a butterfly population. Which of the following describes a density-independent control on a butterfly population? (select all that apply) -A heat wave causes 80% of the butterflies to die while they are still eggs -A contagious disease sweeps through the population, killing 80% of the butterflies -A severe rainstorm drowns 80% of the butterflies -The females lay many eggs on each plant, such that the caterpillars eat nearly all the leaves and 80% of the caterpillars starve before becoming adults -A late spring cold snap reduces temperatures to outside the butterflies’ tolerance and 80% of them die in their cocoons