Learning how to ride a bike no easy task. most people learn as children and mount their first bicycle with training wheels mounted on the sides of the back tires. those training wheels eventually come off. when that happens, usually someone runs behind the bicycle holding the back of the seat as the rider learns to balance on two wheels. as the runner runs back and forth down the street, the rider eventually picks up on how to lean to stay up on two wheels. eventually, the runner lets go of the seat, and the rider rides off on his or her own. " what is the central idea of this passage? (this sentence should be written in a complete sentence with textual evidence)