Question 39
Question 39 of 40
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No letter options?
Older MCQs might not have the typical A, B, C, D choices. They have choices 1, 2, 3, and a combination of them is the answer. Below is the key that maps such combinations to the answer.
A 1, 2 and 3 are correct
B 1 and 2 only are correct
C 2 and 3 only are correct
D 1 only is correct
Topics Tested
20. Human influences on e...
20.3. Pollution

Describe the sources and effects of pollution of the air by methane and carbon dioxide, limited to: the enhanced greenhouse effect and climate change

11. Gas exchange in human...
11.1. Gas exchange in humans

Describe the differences in composition between inspired and expired air, limited to: oxygen, carbon dioxide and water vapour