Which is a density-independent factor for a flock of Canada geese on a large lake?

Question 7 options:

dwindling food supply

infectious virus

intestinal worms

unusually cold winter

Infectious virus and unusually cold winter

Explanation:

Density independent factors are those factors that regulate the size of a population but are not influence by its density. They normally wipe out a certain percentage of individuals in the population independent of its density. These factors cause a sudden decline in the population by killing the organisms directly and by diminishing one or more necessary resources.