Question

what is the use of a stopper​

Answer 1

Answer:

Chemists frequently use rubber stoppers in their labs to plug flasks and test tubes. The purpose of these stoppers is to prevent liquids, and sometimes gases, from escaping their containers, as well as prevent contaminants from entering the containers. ... Choose the correct number of holes in the stopper.

Answer 2

Answer:

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to stop things from moving .

for example door