| Date | May 2013 | Marks available | 1 | Reference code | 13M.1.SL.TZ1.22 |
| Level | Standard level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Question number | 22 | Adapted from | N/A |
Question
The long-term exposure of bacteria to antibiotics has led to the spread of resistant strains (for example, of Clostridium difficile). What is this an example of?
A. Convergent evolution
B. Immunity
C. Natural selection
D. Dominance
Markscheme
C
Examiners report
N/A
Syllabus sections
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