Final answer:
If Elodea is dying, the lack of photosynthetic growth results in an increase in carbon dioxide concentration, more acidification, and a lower pH.
Step-by-step explanation:
In the process of photosynthesis, green plants like Elodea use carbon dioxide (CO2) from the environment, convert it into oxygen (O2), and release it into the surroundings.
If Elodea is dying, it means that photosynthetic organisms, like Elodea, are not able to grow.
As a result, the carbon dioxide levels in the water will not be consumed by Elodea, leading to an increase in carbon dioxide concentration, more acidification, and a lower pH.