Human: I'm a scuba diver. I want to know if the ozone hole is affecting the marine life in the ocean. Assistant: 
The ozone hole has had some effects on marine life, but it's difficult to quantify exactly how much of an impact it has had. It can be hard to tell whether changes in species distribution and abundance are due to climate change or the ozone hole because both factors affect ocean chemistry. However, research has shown that the decrease in ozone levels caused by the hole has led to lower numbers of phytoplankton, which are important for the health of many marine species.