instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Elements are pure substances that make up all matter.
answer:
Elements are pure substances that make up what?


question:
Environmental changes is most responsible for the extinction of most species of plants and animals that have lived on earth.
answer:
What process is most responsible for the extinction of most species of plants and animals that have lived on Earth?


question:
The voltage and current are exactly in phase in a resistor.
answer:

The voltage and current are exactly in phase in a what?