What is the difference between virus and viroids?

1.Virus was discovered by D. J. Ivanowsky in 1892Viroids was discovered by T.O. Diener in 1971
2.They are larger in size than viroidsThey are smaller in size
3.They possess protein coat called capsid and nucleic acid as genetic material.They lack protein coat and exist as free RNA
4. They possess either DNA or RNAThey possess single stranded circular RNA

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