What valve should be used when the flow is in one direction?

Which of these gives the best indication that a health service is based on pseudoscience?

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

Which of the following is not of the top health concerns in the united states