Which word is most closely related to the word first?

a.
r-waves

b.
s-waves

c.
l-waves

d.
p-waves

answer: d.

a lack of valuable natural resources

explanation:

within these regions are all the major types of biomes in the world. a biome is a community of animals and plants spreading over an extensive area with a relatively uniform climate. some diverse biomes represented in north america include desert, grassland, tundra, and coral reefs.