The polygenic tree of life is based on

mRNA

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rRNA

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tRNA

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DNA

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Solution

The correct option is B rRNA
The rRNA is the abbreviated form of ribosomal RNA. This form of RNA is considered as the basis of the polygenetic tree. The mRNA and tRNA in most of the organisms are similar in structure and function. The rRNA is different and the structure is used to study the evolutionary history of different organisms.
Thus, the correct answer is option B.

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