Answer:
B. by consuming plants
Explanation:
A lot of people are getting tricked by this question because everyone knows nitrogen is the most prevalent gas in air. But that's not what the question is asking. The USABLE FORM of nitrogen enters our bodies by consuming plants.
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>
For the first question, the third choice seems best.
For the second question, it's light moths.