To be considered a living thing an organism must be able to a. move independentlyb. adapt to changec. produce oxygend. increase in size

Pretty sure the answer is B. Adapt to change.

Hope this helps :)

increases the risk of extinction 

explanation:

the answer is that if the species suffers from the disease, there is nothing stronger than the others, so it is possible to remove wholeness. an example of this is hunger in irish potatoes, which has a deadly disease bearish part of all potato harvest masses. pretty much ruins the land of crops.