The organisms which lack a cell wall and can live without oxygen are

Thermoacidophiles

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Methanogens

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Archaebacteria

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Mycoplasmas

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Solution

The correct option is D Mycoplasmas
Mycoplasma is the smallest bacteria which is capable of self-reproduction. It lacks a cell wall around its cellular membrane. Due to the absence of a cell wall, it is resistant to antibiotics like penicillin. It is anaerobic bacteria. It can live without oxygen.
Thus, the correct answer is 'Mycoplasma.'

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