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20 What is the best explanation for why there are no organisms represented by the white circles after the “natural event”?



I. A new predator migrates into an ecosystem and preys on lizards that are unable to camouflage.

II. A virus kills a number of organisms that do not have a specific genetic resistance.

III. A forest fire reduces the population of cedar trees in a particular region.

(1 point)
Responses

I and II only
I and II only

I and III only
I and III only

II and III only
II and III only

I, II and III

1 answer

II. A virus kills a number of organisms that do not have a specific genetic resistance.

This is the best explanation because viruses can eliminate organisms that do not have the genetic resistance to survive, leading to the absence of these organisms represented by the white circles after the natural event.