Final answer:
Photosynthesis releases oxygen and respiration releases carbon dioxide in the distribution of gases in seawater.
Step-by-step explanation:
Photosynthesis and respiration play important roles in the distribution of gases in seawater.
Photosynthesis is the process by which plants and some algae convert carbon dioxide and water into oxygen and glucose. It releases oxygen into the atmosphere, helping to maintain oxygen levels.
Respiration is the process by which cells break down glucose and use oxygen to produce energy, releasing carbon dioxide as a waste product. This carbon dioxide dissolves in seawater, contributing to the carbon cycle.
Therefore, the correct answer is a) Photosynthesis releases oxygen, and respiration releases carbon dioxide.