Which organism has a challenge to maintain cellular electrolyte and ﬂuid balance in its environment?

Question

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All of the choices listed face challenges in maintaining cellular electrolyte and fluid balance due to their environments. A protozoan in a freshwater lake must prevent water from flooding into its cell due to osmotic pressure. Similarly, a bacterium in a freshwater lake faces the same challenge. A bacterium in the Great Salt Lake must prevent water loss and manage high salt concentrations. Each organism must employ mechanisms to maintain homeostasis in their respective environments.

Which Organism Has a Challenge to Maintain Cellular Electrolyte and ﬂUid