After DNA replication, there is always a new strand and old strand. (DNA contains two strands)
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Scientist study index fossils so they will get an understanding of what life was like back then.
<span>The extracellular fluid would have more salt. This would be because more of the sodium would be found in the blood than in the cells. Keeping a static level of sodium in the bloodstream is necessary for the proper cell activities, but increasing sodium intake can lead to negative effects.</span>
