Misc: Who sang in duo with Elton John, "Don't go breaking ny heart" in 1976?

Questions

Genus of annual and perennial herbs (Buttercup) containing about 20 species, grown for their showy flowers?

Gary Puckett sang 'Lady Willpower', among others. Name his backup band?

Energy waves produced by the oscillation or acceleration of an electric charge. Electromagnetic waves have both electric and magnetic components?

Visual representation of individual people, distinguished by references to the subject's character, social position, wealth, or profession?

The force that brings moving bodies to a halt is ___________?