The Moon is visible to observers on Earth because of
A: reflected sunlight

Which change in the environment would have a negative effect on the survival of a species in an ecosystem?
A: introduction of a competing species

When stratospheric ozone levels are reduced, the amount of ultraviolet radiation hitting Earth increases. Ozone depletion is most often caused
A: when fluorocarbons are released into the atmosphere.

One example of matter is
A:
water