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Any solution in nature, industry, kitchen, organism involve a solute.
The solution will be neutral to nature.
The significance (if any) depends on the nature of the problem.
Without the large surface are, the gills would have to be much larger and that may have prevented the development of the organisms that use gills.
The nature of the solution be it acidic or basic will determine the PH value of the given solution.
This depends on the nature of solution.
They are pulling the water they are swimming in across their gills. Therefore, freshwater fish are taking in a very dilute solution of salt water (> 0.9% salt) while saltwater fish are taking in a relatively concentrated solution of salt water (3-5% salt).
Hand washing solution are also basic.
like any other fish. water passes through their gills and the gills absorb the oxygen through their gills.
Not necessarily - the Axolotl and newts both have gills - but they are not fish.
It is a value which indicates the acidic or basic nature of a solution.
There gills are located at the back of their heads