Given a scientific passage and an answer, generate a question for the given answer.

Ex Input:
Passage: From a human point of view, natural resources can be classified as either renewable or nonrenewable. Answer: renewable or nonrenewable

Ex Output:
How can natural resources be classified from a human point of view?

Ex Input:
Passage: Nutrients are substances that the body needs for energy, building materials, and control of body processes. Carbohydrates, proteins, lipids, and water are nutrients needed in relatively large amounts. Vitamins and minerals are nutrients needed in much smaller amounts. Answer: nutrients

Ex Output:
What are substances that the body needs for energy, building materials, and control of body processes?

Ex Input:
Passage: The DNA of a chromosome is encoded with genetic instructions for making proteins. These instructions are organized into units called genes . Most genes contain the instructions for a single protein. There may be hundreds or even thousands of genes on a single chromosome. Answer: genes

Ex Output:
What are the organized instructions within dna for making proteins called?