In french 1921 is what

1921 est le mille neuf cent vingt et unième nombre.

Explanation:

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CDC regulation:

factories cannot dispose of anything containing mercury near a water systems

children must be vaccinated before entering school

CDC enforcement:

educate people and organizations about health regulations

evaluate effectiveness of health care services

monitor workplaces to see if they are following safety procedures

make sure food producers and suppliers are following food safety regulations

I hoped this helped :)))