man a: how'd that dog crap get on my bed?  man b, who had put it there because man a is such a neat freak: must be abiogenesis
(noun) [spontaneous generation]
"man a: how'd that dog crap get on my bed?  man b, who had put it there because man a is such a neat freak: must be abiogenesis" What is the definition of "abiogenesis"?