2 Why is it necessary to use units, such the light-year, when discussing characteristics of the
universe?
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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.

characterization of nanoparticles is a critical step in nanomaterial production as it provides information of dimension, morphology, surface charge, distribution and degree of surface functionalization.

a chair, a bed, and a toothbrush

explanation:

carbon atoms, hydrogen, oxygen, and nitrogen.