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

The right answer is B (the second one, ribose and deoxyribose).

Phoebus Aaron Theodore Levene was a Lithuanian biochemist emigrating to the United States. Levene studied DNA extensively and found that it contains adenine, guanine, thymine, cytosine, deoxyribose and phosphate group. He discovered ribose in 1909 and deoxyribose in 1929 in the Rockefeller Institute.

some of your causes might be acidic rain or natural wildfires that cause the parks to be degraded

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the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.