Given a scientific question, generate a correct answer to it.

Input: Consider Input: Clubmosses are not true mosses, though, because they have what?

Output: vascular tissue

Input: Consider Input: What done ozone help protect against?

Output: ultraviolet rays

Input: Consider Input: What term is used to describe an illusion that light from faraway objects is reflected by a pool of water that is not really there?
Output: mirage