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The table compares the `\text{CO}_2` emissions of three transport systems - car, train and aircraft.
The table shows that these transport systems produce different amounts of `\text{CO}_2` emissions per passenger.
Why are these different transport systems still required? (2 marks)
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The diagrams show two bicycles, one from 1900 and one from 2020.
The basic components of the bicycle frame have not changed for 120 years. However, manufacturing and materials technologies have evolved significantly during this period.
Compare TWO technologies used in the production of modern bicycle frames to those used in earlier times.
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