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How many statements are correct with res...

How many statements are correct with respect to chrysophytes ?
(i) They are found in the marine environment , freshwater organisms are very rare.
(ii) In diatoms , the cell wall form two thick overlapping shells which fit together as in a soapbox .
(iii) The cell membranes of diatoms are embedded with silica and accumulation of them over billions of years is referred to as "diatomaceous earth "
(iv) Diatoms are the chief " Producers" In the oceans .

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