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Select the correct combination of the st...

Select the correct combination of the statements (i-iv) regarding the characteristics of certain organisms.
(i) Methanogens are archaebacteria which produce methane in marshy areas
(ii) Nostoc is a filamentous blue-green alga which fixes atmospheric nitrogen
(iii) Chemosnthetic autotrophic bacteria synthesise cellulose from glucose
(iv) Mycoplasma lack a cell wall and can survive without oxygen
The correct statements are

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