What is First Line of defence in immune system? Physical, Chemical & Biological barriers involved.

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A summary of First Line of defence in immune system. @biologyexams4u
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[@bts_rollercosterlifepurplearmy]

I just looking for easy but point to point explanation and i got this 👍👍👍

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Good video for introductions before going to cellular levels

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Thank you sir for information....

[@kalpanavallapudasu3793]

Nice explanation tq sir

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Just sharing a related video for your reference
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Namaste

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🙏 Thank you