The institutional review board committee's major concerns are protecting human research participants from physical or mental harm, as well as protecting the researcher from unnecessary complaints.
a. true
b. false

a. True

Explanation:

The main aim of the IRB is to safeguard the right of the human subjects used for the purpose of research conducted by the governmental authority. It also emphasizes over the protection of the researchers from illegal complaints. The risks to the human subjects can be minimized by using procedures which cause no harm to them and a detail consent of the research practice should be taken from these subjects by informing the purpose of research.

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.