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electron microscope
You should examine the solution for growth at regular intervals.
It is. (There is no question of should or should not.)It is. (There is no question of should or should not.)It is. (There is no question of should or should not.)It is. (There is no question of should or should not.)
Only if there are more than 2 objects in the series.
To determine the value of old coins, one should first examine the date on the coin and recognize the country of issue. Then, note the rarity of the coin, examine its condition, and observe the demand. Finally, consult a coin catalog for confirmation of the value.