[Solved] The most reliable evidence in studying the past is that which is visible to the naked eye.Anything microscopic is too small to be considered reliable. Relevant Time Period: The specific duration during which certain actions are undertaken or conditions apply, significant for analysis or decisions. Price Elasticity: An indicator that measures the impact of price change on the demand for a good. Cannondale Mountain Bike: Cannondale Mountain Bike is a specific type of bicycle designed for off-road cycling, produced by the Cannondale Bicycle Corporation, known for its innovation and quality. Bicycle: A human-powered, pedal-driven vehicle with two wheels attached to a frame, one behind the other.