The answer would be minerals, I've had this question before.
It depends on how they are genetically engineered
<span>Similarly to cells, viruses can spread and grow, as well as mutate. They can change what they do becoming even more deadly or they can become immune to medicine. They can also spread from cell to cell, then from people to people, change the way they spread as they mutate, and many many other things that are usually bad for humans.</span>
I believe the correct answer is that the <span>change in pH would destroy the herbivores present in the lake. Due to the increase in pH algae could not survive in the lakes so they find other places wherein they could reproduce therefore increasing the population of </span><span>periphytic algae.</span>
