Final answer:
Salinity influences organisms in aquatic ecosystems with freshwater organisms facing challenges related to excessive water intake and dilution of cell solutes.
Explanation:
Salinity plays a crucial role in aquatic ecosystems by influencing the organisms present due to the process of diffusion. Organisms living in freshwater face the challenge of their bodies taking in too much water, which can lead to dilution of cell solutes and potential harm to their functioning. Factors such as dissolved oxygen concentration, water temperature, salinity, currents, and tides are essential abiotic factors in aquatic environments.
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