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A) DNA fulfils all three conditions:
<span>(1) copy itself precisely - in the process of replication, DNA copies itself and two molecules of DNA are formed. This process is very precise thanks to the great number of proteins involved in these process that prevents error occurring and proteins that can fix the error if it occurs.
(2) be stable but able to be changed - DNA is very stable molecule otherwise, it cannot be a genetic material. However, its chains can separate in a short length so the translational machinery can attach to it and the process of transcription can occur. Also, in crossing over, during meiosis, </span>the exchange of genetic material occurs and chromosomes change a bit.<span>
(3) be complex enough to determine the organism’s phenotype - it contains a number of genes responsible for different traits. All of this results in the </span>organism’s phenotype.
B) DNA copies itself. <span>Meselson and Stahl conducted the experiments on DNA replication in which they used </span>E. coli<span> bacteria as a model system. After they labelled all bacteria's DNA with heavy 15N by using medium with heavy 15N, they switched bacteria to medium with light 14N. After several generations, all bacteria's DNA was labelled with light 14N. This experiment evidenced that the self-replication of DNA is semi-conservative process.</span>
40% of the Earths rain forests have been lost to deforestation since 1950.
Excess sodium<span> in diet affects many </span>body functions even for those who are salt resistant,<span> Consuming </span>too much salt can harm<span> many </span>organs<span> and blood vessels.</span>
First of all we could start by verifying the clinical history. We could review past health complications, as well as present diagnosis that might be conditioning the hydration. Look for signs or symptoms such as lightheadedness, variations on the input/output of fluids, altered mental accuracy, etc. Recent gut problems and other bowels' problems should also be reviewed. Current medication should also be considered.
From a physical examination point of view, there should be a checking of vital signs, and evaluation of orthostatic blood pressure and any considerable swallowing.
