What two features must a sample have if it is to accurately represent a population

It must be large

Random

Explanation:

For a sample to represent a population accurately, it must be large and contain random sample spaces.

A population is a group of organism of the same species living in a particular place where they can reproduce.

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).