*Question*
Q: Why do comet tails always point away from the sun instead of trailing behind the comet? Choices: - dust particles attract - dust particles evaporate - dust particles liquify - dust particles recoil A:
**Answer**
dust particles recoil

*Question*
Q: What is the term for the force exerted by circulating blood on the walls of blood vessels? Choices: - circulation pressure - heart pressure - blood energy - blood pressure A:
**Answer**
blood pressure

*Question*
Q: What device uses electromagnetic induction to change the voltage of electric current? Choices: - electric combustion - electric conductor - convection device - electric transformer A:
**Answer**
electric transformer

*Question*
Q: Tidal volume, expiratory reserve volume, inspiratory reserve volume, and residual volume are all types of what kind of measurement? Choices: - respiratory volume - emitted volume - breathing volume - lung volume A:
**Answer**
lung volume