The main function of the lungs is the process of gas exchange called respiration (or breathing). In respiration, oxygen from incoming air enters the blood, and carbon dioxide, a waste gas from the metabolism, leaves the blood. A reduced lung function means that the ability of lungs to exchange gases is reduced.
Answer:
If it is tested in a controlled setting with repeated results
Explanation:
I think the answer is d because I think it eventually becomes saturated. I hope it's right.
Water may become polluted and also become scarce to the agriculture due to the population increase
Most of animal-like protists are heterotrophs
