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The pathogen can be transferred to the host in a number of ways, from contact to the transfer of bodily fluids. If someone sneezes that can be a way of contracting the pathogen in the air, for you may breathe it in. There are also waterborne diseases.
cellulose is a polymer of glucose and serves as a source of dietary fibre for humans.
Cell-Mediated Immunity
Agrobacterium tumefaciens
Because they are seen as pathogen invaders by the immune system.
Subterranean water is generally free from pathogens
NADPH2
Convection
It serves as the main source energy of the body.
carbon dioxide XD
cellulose
The fat bodies.