The danger posed to fish in an aquarium by an overpopulation of bacteria caused by an algal bloom is most likely a
A: reduction in oxygen levels.

Which property of water can cause a rock to break apart?
A: Water expanding as it freezes.

The brown tree snake is a nonnative species found on the South Pacific island of Guam. The brown tree snake population in Guam is so large that it negatively affects the humans there. Which statement best explains why the brown tree snake has flourished in Guam?
A: There are no natural snake predators.

The spectrum of visible light can be seen in a rainbow because white light is
A:
refracted and dispersed.