Stratosphere is the correct answer
Yes they will have to learn about the other branches of biology so that they can have more background knowledge on evolution and can also have facts to back the fact that evolution is true
Carbon dioxide is transported in the blood in three ways: (i) dissolved in solution; (ii) buffered with water as carbonic acid; (iii) bound to proteins, particularly haemoglobin. Source: https://academic.oup.com/bjaed/article/5/6/207/331369
Preventing ph changes caused by the rising and falling pco2 of the plasma
