1. Make an observation
2. Form a question
3. Form a hypothesis
4. Conduct an experiment
Well, one of the corresponding elements that is essential for the production of ATP is phosphorus, there are 3 elements of phosphorus in the form or as a polyatomic ion with oxygen, phosphate. Speaking of which, oxygen for the above reason as it composes phosphate is also a crucial element that ultimately produces a single molecule of ATP.
I think B is answer because Boiling point is a physical property.
Cold Southern Oceans like the Pacific, Atlantic, Indian, etc. are collecting CO2 from the air!