Question

how does acid rain impact aquatic ecosystems?
a acid rain decreases the temperature of water, making it difficult for aquatic organisms to survive.
b acid rain increases the ph of water, making it difficult for aquatic organisms to survive.
c acid rain increases the temperature of water, making it difficult for aquatic organisms to survive.
d acid rain decreases the ph of water, making it difficult for aquatic organisms to survive.

Explanation:

Acid rain contains acidic substances. pH is a measure of acidity/alkalinity. Lower pH means more acidic. Acid rain would lower the pH of water (make it more acidic). Aquatic organisms are adapted to a certain pH range. A lower pH (more acidic water) due to acid rain can disrupt their physiological processes and make survival difficult. Options A and C are wrong as acid rain doesn't directly affect water temperature in this context. Option B is wrong as it says pH increases (which would make water more alkaline, opposite of what acid rain does).

Answer:

D. Acid rain decreases the pH of water, making it difficult for aquatic organisms to survive.