Which process(es) introduce oxygen into the ocean.

mixing only
industrial wastes
mixing and photosynthesis
chemical equilibrium

The correct answer is mixing and photosynthesis.

The process of photosynthesis helps to produce oxygen in ocean by the help of blue green algae, phytoplankton. Like other plants, they also do photosynthesis , that uses sunlight and carbon dioxide to make food. The by product of this process is oxygen. This oxygen gets mixed into the ocean and helps the aquatic animals to survive.

the water is warmed up by the sun and then it evaporates into the atmosphere. the sunlight warms the water by its heat. water is then cooled down and condensation takes place. the water then finally returns back to the earth by the process of precipitation in the form of rain or ice.

explanation: