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Because the surrounding freshwater concentration is higher than the salt concentration inside and so all the water from the vacuoles has left because of osomosis. while the marine amoeba has the surrounding salt concentration equal to the concentration inside the vacuole.

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Q: Why would you expect a freshwater amoeba to be more likely to have contractile vacuoles than a marine amoeba?
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Why would you expect a freshwater amoeba to be more likely to ha contractile vacuoles than marine amoeba would?

Marine amoebae live in a saltwater environment. If the vacuoles take in too much salt, it'll suck all the liquidy stuff out of the amoeba itself. Freshwater amoebae are in a freshwater environment so they don't have to worry about that.


Why would you expect an animal that lives in freshwater to have a well-developed excretory system?

They are most prominent in freshwater amoebae as marine amoebae are closer to isotonicity with seawater than freshwater.


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Would you expect an amoeba that lives in a cold pond during the winter to have higher or lower percentage of saturated fatty acids in its membrane during the summer compared to winter?

I will expect it to have lower percentage of saturated fatty acids since in summer the ponds become warmer than in winter,therefore the fatty acids will behave under the condition of a warm room termperature were they do not become closely packed( not rigit).


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You would expect to find photosynthetic organisms at the greatest depth in the euphotic zone of the ocean. This is because sunlight can penetrate to this depth, providing the necessary energy for photosynthesis. Beyond the euphotic zone, light levels decrease rapidly, making it difficult for photosynthetic organisms to survive and carry out photosynthesis.


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