In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.

Question: What do you call the movement of molecules across a membrane without the input of energy? Answer: passive transport
You call the movement of molecules across a membrane without the input of energy passive transport.

Question: When blood vessels in the head dilate, what kind of severe headache can occur? Answer: migraine
When blood vessels in the head dilate, a migraine, a severe headache, can occur.

Question: When a stream flows from a hard to  soft rock area, what is often formed? Answer: a waterfall

A waterfall a stream flows from a hard to  soft rock area, what is often formed.

