GENERAL KNOWLEDGE: A volunteer cavalry force merged into the Territorial army in 1907?

Questions

Who wrote The Monkees hit I'm a Believer?

What is the rarest of the naturally occuring elements,estimated to be only half a gram of it in the earths crust?

What is the real name of The aint in Leslie Charteris' books?

What recent film was advertised with the catchline "Dead in the heart of Texas?

What creature can jump 200 times its own length?