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: O2 molecules stacked on top of each other create weight which is then tallied by a? Answer: barometer.
answer:
a barometer is used to measure air pressure

question:
Question: slope is a measure of the difference in elevation from the top to the base of a? Answer: pyramid.
answer:
slope is a measure of the difference in elevation between one part of the land and another part of the land

question:
Question: Which is likely to disappear? Answer: the last surviving member of a population.
answer:
if all members of a species cannot produce offspring then that species will likely become extinct