Answer:
The nitrogenous bases guanine and adenine are A. purines.
Explanation:
Adenine and guanine are purines, whereas the other two bases in DNA (thymine and cytosine) are pyrimidines. The main difference between purines and pyrimidines is the number of rings that the base has: purines have two rings while pyrimidines only have one ring.
In addition, phosphate group and sugar group cannot be the answer to this question because these two elements in addition to a nitrogenous base makes up a nucleotide.
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Answer:
Explanation:All matter has mass and occupies space. All physical objects are made of matter. Matter itself is composed of tiny building blocks known as "atoms".
The water level in the bog would rise during heavy or prolonged rain.
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The main source of heat energy in the earth's inner core is radioactive decay, and the radiogenic heat producted by the radiogenic decay of isotopes in the mantle and crsut. I hope this helped
