Q: Mirrors and lenses are used in optical instruments to reflect and refract what? Choices: - gravity - mass - electricity - light A:
light

Q: Contributing to the blood-brain barrier is one of the jobs of glial cells, which support neurons in what system? Choices: - peripheral nervous system - circulatory system - digestive system - central nervous system A:
central nervous system

Q: What weather events move with the prevailing winds and originate in the trade winds in the northern hemisphere? Choices: - tsunamis - earthquakes - droughts - hurricanes A:
hurricanes