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By the most general biophysiological definition<span>, the </span>biosphere<span> is the global ecological</span>system<span> integrating all living beings and their relationships, including their interaction with the elements of the lithosphere, geosphere, hydrosphere, and </span>atmosphere<span>.
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<span>a. constructed from thick aluminum walls that can control the nuclear reactions </span>
<span>This would be an example of a mutation, because the changing of allele frequencies would be a change within the gene itself, which would be a mutation in the DNA. This is evidenced by the fact that there is now a form of human resistance to malaria, due to changes within human DNA itself.</span>
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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