Q: Is the Greek alphabet as common as Sumerian cuneiform?
A: The Greek alphabet is still commonly used. Sumerian cuneiform is not used contemporarily.
The answer is no.

Q: Did Karl Marx influence the communist party of China?
A: Communist ideology is the foundation of communist party of China. Marx produced a political pamphlet that has since come to be commonly known as the communist manifesto.
The answer is yes.

Q: Should cactus soil always be damp?
A: The amount of water a cactus needs depends on the weather and season. When the weather isn't hot, a cactus needs very little water.
The answer is no.

Q: Does Darth Vader's character resemble Severus Snape?
A:
Darth Vader is portrayed as a man who always appears in black full-body armor and a mask. Severus Snape is portrayed as a white man with long, greasy black hair who often wears a cloak.
The answer is no.