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Dr. Md Rushad Rahman
এমবিবিএস(আরপিএমসি)
,
পিজিটি(মেডিসিন)
The inner jar is filed with air and serves the purpose of maintaining a narrow area for the ants to build their tunnels. This ensures you will be able to see the tunnels. Without the small jar, the ants would tunnel deep into the main jar and you would not be able to see their tunnels.
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