Which of the following statements describes why the central lowland region is primarily tall-grassland prairies?

a) recurrent natural fires prevented trees from growing.
b) generally, there is insufficient rainfall to support trees.
c) cold air masses continually descend from the north.
d) only grass can grow on the marshy lands.

Select the correct text in the passage. the moving continents affect all subsystems on earth. which sentence identifies a potentially negative consequence of shifting continents? the supercontinent pangaea began to break up about 175 million years ago. [during this process, more coastline was exposed as the landmasses separated]. [the rearrangement and displacement of these huge landmasses resulted in the diversity of plants and animals we see on earth today]. [the movement of the plates sometimes leads to earthquakes and tsunamis]. however, over the long course of earth's history, their effects are usually minimal. in oceans, the plate movements usually lead to seafloor spreading. [seafloor spreading often results in the formation of underwater ranges of mountains].