Methanotrophs are those microbes (bacteria) which feeds on methane or used methane as energy source for their survival. These type of microbes survive by using single carbon compound as a source of energy. So we can say that due to the presence of Methanotrophs, the level of methane decreases while there is no change occurs in oxygen saturation level.
Diagnostic and Statistical Manual of Mental Disorders, 4th Edition, Text Revision gives a classification of recognised mental health disorders in the form of DSM-IV codes.
The fear of clowns is described as a specific phobia with a code of 300.29.
A specific phobia is a fear that lacks a reason or rational against an exposure to a certain object or situation.
Such specific phobias can leads to a disability in normal life as people suffering from such phobias tend to avoid situations where they may encounter such phobias.
The fear of clowns is known as Coulrophobia which is a type of specific phobia when it interferes with the normal functioning and is persistent.
Since Francis becomes anxious upon seeing a clown since he was 6 years old and the fear persists and he avoids going to places where he sees clowns, he has specific phobia against clowns.