I had to pull my 6th-grader in for some help with your example, Amy:-p
Thanks for sharing this week. I like the visual feedback you added for the markers to indicate correct and incorrect choices. That's a nice touch and something I think a lot of experienced users don't even know is possible with markers.
The only feedback I'd offer is regarding the placement of the on-slide submit button. I didn't expect to see it in the same place as the previous button. Being a primary button, I'd expect to see it visually emphasized over the next button. And thinking about it, since the next button is inactive, you could either 1) add opacity to reduce its emphasis or even place the submit button in the next button's location.
Anyway, this is a great example of lightbox slides (and general course design) for biology classes. Recap updated:
https://community.articulate.com/articles/ways-to-use-lightbox-slides-in-elearning#amy