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How is 'diatomaceous earth' formed?...

How is 'diatomaceous earth' formed?

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Diatoms are also called as 'pearls of ocean' why ? What is diatomaceous earth ?

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Diatomaceous earth is used in

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Diatomaceous earth is used for all except

Diatoms/Diatomaceous earth belong to class

How many of following features are correct w.r.t Gonyaulax ? Diatomaceous earth, anterior two unequal flagella, toxin kill fishes, chief producers in ocean, red tides, stiff cellulose plate Option 1 four Option 2 three Option 3 six Option 4 two

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Diatomaceous earth is often accompanied by (a) reserved carbohydrates (b) deposits of stones (c) petroleum fields (d) deposits of coal