An example of a density-independent factor would be a specialist searching for the one species of plant that is its food wolves that prey on elk in yellowstone national park record cold temperatures that kill subtropical plants in northern florida suitable nest sites for a flock of kirtland's warblers blight (a mold disease) in a wheat field.

record cold temperatures that kill subtropical plants in northern Florida.

Explanation:

A density-independent factor refers to a factor that does not depend of the size of a population as it will effect the entirety of the population regardless. This being the case I can say that out of the answers provided the one that would be exemplify this is record cold temperatures that kill subtropical plants in northern Florida. This is because Florida temperatures are usually very hot and it is what the plants are accustomed to, therefore record cold temperatures would kill all the plants in Florida regardless of the population size.

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