Plant species x lives in a hot, dry environment. slowly, over hundreds of years, the climate becomes wetter. fungi attack species x and cause the population of species x to decrease. however, plant species x could survive if the plants
(1)try to mutate quickly and synthesize new proteins
(2)are watered often and fertilized with extra nutrients
(3)can adapt to the new conditions by mating with the fungus
(4)have a few members of the population that are fungus-resistant

If a plant species lives in a hot an dry environment and after 100's of years has the climate to become wetter it makes fungi attack and causes the population to decrease. The plant species could survive if the plants have a few members of the population that are fungus resistant. The correct choice will be number 4. 

The analogy says that stem cells were important for medicine, just as the internet was important for communication, because if you look, thanks to the internet, different social networks and different media have emerged. Nowadays it helps a lot of people in different cases, like online classes for certain schools. Without the internet, people would still be talking in person, and in these quarantine times it would not be possible. And the internet also made it possible for strangers to connect, making multiple communities.

I hope I helped, even speaking only on the technology side.