fact and question: if one mineral can scratch another mineral then that other mineral is softer than that one mineral
Question: If one mineral can scratch another mineral then that other mineral is softer than that one mineral, as can be tested with

What's the answer?

answer: a diamond and agate

fact and question: birds sometimes eat seeds
Question: Which of the following might use Chia to fuel it?

What's the answer?

answer: Bird

fact and question: snow falls during the winter in some environments
Question: An area where snow falls more of the year is often

What's the answer?

answer: higher

fact and question: plants are a source of biofuel
Question: If a fuel is a biofuel, it may be

What's the answer?

answer:
corn