Answer:
i believe it is B I could be wrong so dont take my answer for it
All living organisms are composed of cells.
<span>B is quite close, but it defines the existing variation within the population, which is positive but only goes so far if there is not new material being introduced.
C and D decrease the genetic variation of a population
</span><span>So the right answer is A, because it actually results in new genes being created through mutation.</span><span>
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Do you have a multiple choice of the word "these"? It would be easier for me to help you...
