As I teach biology, I can totally related to the subject.
The animation is neat, understandable, clear and appealing.
For the biologic part, you talk about the microbiome in the guts, but show a picture of the stomach. Why?
If I'd watch this with my pupils (who don't master english that well), I'd probably let them do some research to know what was simplified, what kind of sources you used and so on. When my pupils watch movies or read documents, it's one of the main things they have to do and your animation fits to it, as you mention all the sources and show different interpretations of the topic.
Nevertheless It's a good job.
I'll be glad to see more of you!