Question
Write down four characters of mammals. Give two examples.
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| Species Property | $H_2O$ | $CO_2$ | Na atom | $MgCl_2$ |
| No. of moles | $2$ | — | — | $0.5$ |
| No. of particles | — | $3.011 \times 10^{23}$ | — | — |
| Mass | $36g$ | — | $115g$ | — |