9. what is the amount of fluoride concentration in water that's considered safe for the prevention of dental decay? a. 0.25 part per million b. 2 parts per million c. 0.5 part per million d. 1 part per million

Viruses ) manufacture their own atp, proteins, and nucleic acidsb) use the host cell to copy themselves and make viral proteinsc) use the host cell to copy themselves and then viruses synthesize their own proteinsd) metabolize food and produce their own atp