13. Exponential, limiting
14. Keystone
15. Population (not completely sure on this one, may be something like biodiversity)
The four nitrogen bases contribute to the variation between humans because the order of nucleotides determines phenotypic features associated with genetic inheritance.
- In DNA, there are four types of nucleotides, each containing one different nitrogen base.
- The four nitrogen bases in DNA nucleotides are Adenine, Guanine, Cytosine, and Thymine.
- The linear order of these nucleotides in genes largely determines the phenotypic features associated with genetic inheritance.
In conclusion, the four nitrogen bases contribute to the variation between humans because the order of nucleotides determines phenotypic features associated with genetic inheritance.
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The answer is D, all the time
