Question

which discovery is attributed to phoebus levene? extraction and observation of dna identification of ribose and deoxyribose recognition of rna as dnas messenger construction of an accurate dna model

Explanation:

Phoebus Levene identified ribose (in RNA) and deoxyribose (in DNA). DNA was first extracted and observed by Friedrich Miescher. RNA as DNA's messenger was a later discovery. The accurate DNA model was constructed by Watson and Crick.

Answer:

identification of ribose and deoxyribose