What element was pointed out for special attention in the structure of a dna base?
a. oxygen
b. carbon
c. phosphorus
d. nitrogen
e. calcium

The correct answer will be option-D.

Explanation:

Deoxyribose nucleic acid or DNA is the genetic material of the organisms which is composed of nucleotide monomers.  Each nucleotide monomer is made up of a fiver carbon sugar, four different nitrogenous bases and a phosphate group

The DNA bases can be easily distinguished on the basis of nitrogen element as the structure of purine which is adenine and guanine contains four nitrogen molecule whereas cytosine and thymine contain two nitrogen molecules in their structure.

Thus, option-D is the correct answer.

the  frequency of a wave represents  the number of wavelengths that pass a specific point per second. the unit for  frequency  is hertz (hz).

happy to

pls mark as brainliest

can you give me more to work here with plzs and you