An atom is a single form - the smallest form possible eg a hydorgen atom. A molecule is a combination of two or more atoms bound together. It is impossible for an atom to exist by itself

There are two forms of meningitis , viral and bacterial . In humans , both forms are present with the bacterial form being more severe even fatal but a mengitis strain in a dog would have different enzymes for replication and would not manifest itself in humans. It may however be contagious to other dogs … Read more