TASK DEFINITION: Given a scientific passage and an answer, generate a question for the given answer.
PROBLEM: Passage: There are three types of mechanical waves. They differ in how they travel through a medium. The three types are transverse, longitudinal, and surface waves. All three types are described in detail below. Answer: three

SOLUTION: How many types of mechanical waves are there?

PROBLEM: Passage: Prevailing winds are the result of atmospheric circulation cells. They influence the climate of a region. Answer: climate

SOLUTION: What do prevailing winds influence?

PROBLEM: Passage: Chordates are defined by a set of four characteristics that are shared by these animals at some point during their development. In some chordates, all four traits are present in the adult animal and serve important functions. However, in many chordates, including humans, some traits are present only during the embryonic stage. After that, these traits may disappear. Answer: development

SOLUTION:
Chordates are defined by a set of four characteristics that are shared by these animals at some point during their?