In biology, a mutation is a permanent change of the nucleotide sequence of the genome of an organism, virus, or extrachromosomal DNA or other genetic elements.
Salinity is the saltiness or dissolved salt content of a body of water (see also soil salinity).onceptually the salinity is the quantity of dissolved salt content of the water. Salts are compounds like sodium chloride, magnesium sulfate, potassium nitrate, and sodium bicarbonate which dissolve into ions.
Ocean salinity (expressed in-per mil) is approximately equal to the weight, in grams, of salts dissolved in 1000g of seawater. This would be the salt concentration in parts-per-thousand (). Average ocean water has a salinity of 35g of dissolved salts.Expressed in %, it would be 96.5% pure water molecules and 3.5% of salts, dissolved gases, organic materials and undissolved particles. This means that 1000g of average seawater contains 965 grams of water and 35 grams of salts.n case of a saline solution (seawater included), it means that an Isotonic solution is 9 (that's NOT 9% - that's PARTS PER THOUSAND) salt and 991 purified water. In a roundabout way, one might say that Isotonic seawater has only 1/3 the salt content of regular ocean water (not the Dead Sea!).