conduct an experiment pollutants in local water samples and observe the table and write the observation
Answers
Answer:
Unless exceptional events cause effects directly visible to the naked eye, air, and water pollution remain mostly imperceptible. The frequent absence of external signs when pollutants are present, and their ability to blend with other bodies, generate phenomena which are hardly discernible for who doesn’t possess the adequate equipment. Ozone in air and metallic pollution in water, for instance, cannot be noticed immediately. Furthermore, the physical and chemical properties of those contaminants contribute to produce specific moving geographies that escape our ordinary detection devices.
Explanation:
a young and controversial discipline, ecotoxicology developed new observation instruments that allow to diagnose precisely the corruption of the quality of water or the degradation of specific environments. The observation techniques set up by ecotoxicology researchers rely on the sensitive and adaptative abilities of some living entities identified as "sentinel organisms" (providing bioindicators and biomarkers). In 1926, pioneer scientists started drawing up the map of atmospheric pollution by investigating lichen populations. At the end of the 1960s, the USA launched a sea water surveillance program by enrolling mussels in research protocols (Mussel Watch Program). If the presence and distribution of species provide important indications, the study of the biological responses those species produce in reaction to environmental perturbation supply information that are even more precise. Physiological, biochemical, and genetic tests are performed on "sentinel organisms" to reveal and make explicit the presence and impact of pollutants.