Fill in the blanks:
$(1)$ Deficiency of fluoride is responsible for ............. .
$(2)$ The upper limit of lead concentration in drinking water is ............. .
$(3)$ The maximum limit of nitrate in drinking water is ............. .
$(4)$ ............. and ............. chemicals act as poisons for the nervous system.
$(1)$ Deficiency of fluoride is responsible for ............. .
$(2)$ The upper limit of lead concentration in drinking water is ............. .
$(3)$ The maximum limit of nitrate in drinking water is ............. .
$(4)$ ............. and ............. chemicals act as poisons for the nervous system.
(N/A) $(1)$ Tooth decay (dental caries)
$(2)$ $50 \ ppb$
$(3)$ $50 \ ppm$
$(4)$ Organophosphates,Carbamates
$(2)$ $50 \ ppb$
$(3)$ $50 \ ppm$
$(4)$ Organophosphates,Carbamates
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