Question: Plants expel a gas that
Choices:
text: is poisonous to humans
label: A
text: is used to make balloons rise into the air
label: B
text: humans exhale as well
label: C
text: our circulatory system spreads to our body from our lungs
label: D
Answer: D
Fact: the circulatory system brings oxygen from the lungs to the rest of the body