Both answers C and D are correct, however, answer D makes more sense.
Answer:
Sun.
Explanation:
The Sun and other gasses work together and increase the greenhouse gasses.
Dry climates do not have sufficient precipitation during the most of the year.
Desert are located in the arid climate.
The semiarid climate is in a grassland, or steppe, region.
C.
Falsifiable is the adjective form of the verb "falsify," which in science means "prove (a statement or theory) to be false."
