Question

the ph of seawater is regulated by its ______
multiple choice
carbon dioxide concentration
oxygen
temperature
pressure

Explanation:

Carbon - dioxide in seawater forms carbonic acid which affects pH. Higher CO₂ concentration lowers pH (more acidic), lower CO₂ concentration raises pH (more basic). Oxygen, temperature, and pressure do not directly regulate pH in the same way as CO₂.

Answer:

carbon dioxide concentration