One of the leading water pollutants is A elements from construction sites B human and animal waste C emission from automobiles D purifying elements

The provisions of subpart d, of the hhs regulations, additional protections for children involved as subjects in research apply to: all research involving childrenall research that is > minimal riskall research funded by any federal agencyall research funded by hhs

Why is it necessary to obey social norms? write briefly.

Can someone me with these 2 questions? and tell me why it is the correct answer?