Decide which of the given units would be the most appropriate to use for a) the height of a building: kilometres, metres or centimetres? b) the mass of a comb: grams, tonnes or kilograms? c) the capacity of a pond: millilitres or litres?

To determine the most appropriate units for each scenario, let's analyze the context of each measurement: a) **Height of a building**: - **Kilometres**: Too large for a building height. - **Metres**: Suitable for measuring building heights. - **Centimetres**: Too small for practical use in this context. **Most appropriate unit**: **Metres**. b) **Mass of a comb**: - **Grams**: Suitable for small items like a comb. - **Tonnes**: Too large for the mass of a comb. - **Kilograms**: Could be used, but grams are more precise for small items. **Most appropriate unit**: **Grams**. c) **Capacity of a pond**: - **Millilitres**: Too small for measuring the capacity of a pond. - **Litres**: Suitable for measuring larger volumes like that of a pond. **Most appropriate unit**: **Litres**. In summary: - a) Metres - b) Grams - c) Litres