They have different body parts
Oxygen enters the lungs, then passes through the alveoli and into the blood.
Answer:
I know. It's to disagree with everything they say and let your dad go get the milk
Pessimism would be the term. A pessimist often focuses on the most dangerous or bad outcomes in life, letting it cloud their happiness and judgement occasionally(being a mindset/lifestyle and all).
The USDA Center for Nutrition Policy and Promotion.
They created food pyramids and circles as well.
Hope this helps!