Please choose the correct answer to the question: One effect of ocean pollution is that it can reduce populations of phytoplankton and algae. The reduction of these populations might have which impact on an ecosystem?

Answer1: decreasing the level of carbon dioxide in the atmosphere Answer2: decreasing the amount of oxygen being produced Answer3: increasing the amount of marine sediments Answer4: increasing salt-water fish populations

Answer format: answer1/answer2/answer3/answer4