Question

fill in the blank question
one problem with the rna world hypothesis is that scientists have not been able to determine a source of the suger
that could have
been used to make rna on early earth.
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Explanation:

RNA is composed of ribonucleotides, which contain the sugar ribose. A key challenge for the RNA world hypothesis is identifying a natural prebiotic source of ribose that could have existed on early Earth to form the building blocks of RNA.

Answer:

ribose