Which Statement About Biomes, the Major Terrestrial Ecosystems Covering the Earth

Multiple Choice

Which statement about biomes, the major terrestrial ecosystems covering the Earth, is true?

A) Each of the ten major biomes is restricted to just one or two continents.
B) The major factors affecting the distribution of biomes are wind and sunlight.
C) Most natural biomes are unaffected by human activity.
D) Fire is important in some biomes because it creates openings.