Final answer:
Salinity is a key abiotic factor affecting marine ecosystems due to its impact on salt concentration and species distribution.
Explanation:
Salinity is the abiotic factor that affects the ocean by influencing the concentration of dissolved salts in the water, impacting the survival and distribution of marine species. Salinity levels can vary in different ocean regions due to factors like evaporation and precipitation, affecting the overall ecosystem balance.
Learn more about abiotic factors in marine ecosystems here:
https://brainly.com/question/29773665
