When your parasympathetic nervous system works to maintain vital bodily functions so that your body is in its natural balance, it is called .

poor water quality affects most estuarine organisms, including commercially important fish and shellfish. the pollutants that have the greatest impact on the health of estuaries include toxic substances like chemicals and heavy metals, nutrient pollution (or eutrophication), and pathogens such as bacteria or viruses.

amber has allowed scientists to study dna that has been preserved over millions of years.

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.