Scientist have developed methods that allow the insertion of a gene into a bacterium how much this bio technology be helpful to someone who has diabetes

true, i don't really know what you're asking but from the info you provided im guessing the answer is true.

genetic variation will increase because of a new habitat and food source.

explanation:

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.