instruction:
In this task, you are given a question and a corresponding answer. Your task is to generate a fact statement that is useful in answering the given question.
question:
Question: Which likely increased atmospheric CO2 recently? Answer: motorcycles.
answer:
carbon dioxide concentrations in the air have increased over the last decade dramatically

question:
Question: Which of the following relationships is true? Answer: Diamond can scratch Play-Doh, therefore diamond is harder.
answer:
if one mineral can scratch another mineral then that other mineral is softer than that one mineral

question:
Question: Many things in nature change during the seasons, and the most noticeable one in winter is that the plants all? Answer: shrivel away.
answer:
An example of a seasonal change is plants becoming dormant in the winter