Traffic signals at expressway on-ramps use
lights.
a. yellow and green
b. yellow and red
c. red and blue
d. red and green

I think the answer is D. red and green

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.

which elements do geologists measure to determine the age of an organism’s remains? check all that apply.

carbon-14

nitrogen

carbon-12