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Why might describing the color of the organisms not be useful in the dichotomous key? ....

Why might describing the color of the organisms not be useful in the dichotomous key? . Which two organisms were most closely related: spirogyra, volvox, euglena, amoeba and paramecium?

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Use of the dyes under the microscope may change the color of the organism which is why color of the organism cannot be useful in dichotomous key. From the physical appearance-color and shape euglena and paramecium are the most closely related organism.

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