Diatoms stay afloat due to___________?

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According to modern system of taxonomy, living organisms have been classified into?

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Which Vitamin is needed for the formation of a light-sensitive pigment in the retina.

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Which is an organic compound found in most cells ?

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The cell wall is usually composed of two overlapping halves called epitheca and hypotheca in__________?

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The membrane covering the lungs is a

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