Is the testimony of a single witness sufficient to support a conviction?

impossible or inherently improbable, testimony of a single witness is sufficient to support a conviction." (People v. Young (2005) 34 Cal.4th 1149, 1181.) Furthermore, the "'incompatibility of and discrepancies in the testimony, if there were any, the uncertainty of recollection, and the qualification of identity and lack of positiveness in testimony are matters which go to the weight of the evidence and the credibility of the witnesses, and are for the observation and consideration, and directed solely to the attention of the [trier of fact] in the first instance . . . .'" (People v. Mohamed (2011) 201 Cal.App.4th 515, 522.)