AP Bio: The Immune System - Part 1

[@thireinkyaw3207]

Very underrated channel. Thank you so much Mr J,! You are really saving me rn for the AP exam

[@user-nf4qk2po3f]

thank you so much mr johnston my bio savior i love you so much

[@Mariam-iq4if]

I never get bored watching your videos!

[@user-hk6qu7rq2n]

thanks for sharing your talent.
Very helpful!

[@billnye1067]

Great vid!!

[@user-ii5zv8fx5i]

Thank you!

[@alichisti9970]

Urdo lakcher