instruction:
In this task, you are given a fact statement and question based on the fact. Your task is to generate the correct answer for the question. The answer needs to be generated using the context fact statement.
question:
Fact: breathing is when a lung converts from oxygen in air into oxygen in blood. Question: Breathing is when the lungs convert oxygen from inhaled air into?
answer:
oxygen dispersed from respiratory bronchioles through air sacs to hemoglobin proteins


question:
Fact: grey clouds appear before precipitation. Question: In the intermediary before rain falls, observers may note?
answer:
menacing skies


question:
Fact: pollution is when humans pollute the environment with pollutants. Question: Humans contribute to environmental pollution?
answer:

by leaving behind refuse on public beaches