The species diversity of Earth's biomes increases as one goes toward the equator so that tropical rainforests have more species
than boreal forests. Which of the following is not a reason for this increased diversity at the equator? - The equator has greater amounts of solar energy and heat.
- Glaciation events forced organisms toward tropical latitudes.
- Equatorial regions have relatively stable climates.
- Equatorial regions have more habitat specialists.
<span>Erosion by rivers is a main valley-forming
process; other processes, such as movement of the earth's crust and
glaciers, also have an important part in some cases. The rate at which a
river deepens its valley depends on several factors.</span>
