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.
Hope this helps!
Answer:
Underground mining has lower rates of fatal and nonfatal injuries than surface mining.
Probably B would be the right answer
Explanation: The water cycle is when water changes state of matter starting at water than evaporation ( water rising in the air) to condensation ( the formation of a cloud) to precipitation (when it rains) and than repeat. hope this helped.
