Mitochondria and chloroplast are believed to be bacterial endosymbiont because

I. they have self nucleic acid i.e., circular ds, DNA and RNAs

II. 70s ribosomes

III. their membrane resembles that of bacteria

IV. ETS and ATP forming machinery is present.

(a) I and II

(b) I, II and III

(c) All of these

(d) I and IV

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