A student is using hydrochloric acid in an investigation. Which piece of safety equipment is most important during this investigation?
A: goggles

Which of the following best describes a role of mushrooms in ecosystems?
A: breaking down dead plant material

In 1987, a supernova was detected in the Large Magellanic Cloud galaxy, which is approximately 169,000 light years from Earth. Which event produces a supernova?
A: the explosion of a massive star

Copper is used in house wiring because it is
A:
an electrical conductor.