Masks are a key measure to suppress transmission and save lives. These masks are intended for industrial workers to prevent dust and particles from being breathed in as the valve closes on inhale. However, the valve opens on exhale, making it easier to breathe but also allowing any virus to pass through the valve opening. This makes the mask ineffective at preventing the spread of the virus or any other respiratory virus.
hope it helps :)
The answer to this question is D
A memoir would be just such an example.
That chair has long legs.
wheres the excerpt? then someone can help you
