PLEASE HELP ME If you had to monitor an ecosystem for evidence of pollution, what are one or two indicator species you would want to pay particularly close attention to? You may discuss specific of organisms, or can discuss organisms that occupy a specific trophic level in an ecosystem’s food web. Explain why you would select theses species or this trophic level.

compost can be added to topsoil as a:

pesticide

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.