What type of energy is stored in a stretched rubber band

In a voltaic cell, electrons flow from the (positive/negative) to the (positive/negative) terminal.

Humidity is to blame for that muggy, steamy feeling you experience on some hot summer days. what gas in the atmosphere causes humidity? a) oxygen b) hydrogen c) nitrogen d) water vapor

Scientific models are based on current knowledge, which can limit their effectiveness when new discoveries are made.