What’s the difference between a primary source and a secondary source? A primary source was written by someone who actually experienced

What’s the difference between a primary source and a secondary source? A primary source was written by someone who actually experienced the event. The difference is about where the source appears—online or in print. Primary sources are shorter than secondary sources. The difference is about how closely the source re

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  1. Answer : romans built laws to manage the pollution which was lead by smoke produced by the factories.

    they had the law tat factories that produces smoke cannot be built near residential buildings.

    building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

    also they built water systems to provide water in those areas which are drought prone.

  2. 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.

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