Suppose that you are studying the diet of wild birds. Your hypothesis is Wild birds prefer sunflower seeds to cracked corn during the winter.
Define inference:

helicase, i think thats it

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.