Relate cause and effect how does crossing-over increase variation in genes?

Would really appreciate it, i have an idea but not completely sure

The energy available as a result of the motion of a body is called energy. -potential -gravitational -kinetic -chemical

2. cheryl hears a new song on the radio every day during the week on her commute to work. surprisingly, when the song comes on at a party on saturday night, she knows most of the words without trying. describe the three ways that we use cognition to learn without reinforcement. which type of cognitive learning without reinforcement best explains how cheryl knew the song lyrics? explain your answer.