Great lesson. Just a few grammatical errors. I think this lesson may be a bit long and would work best if it were broken up a bit-over 200 slides may be overwhelming to attempt in one lesson. You cover a lot of material but some of the slides were a little crowded with information.
**Additionally, it does not appear that ther are multiple means of of action and expression or engagement (perhaps an outlink to a video or other material would be useful or even an interactive map regarding biomes).
When a question is answered incorrectly on a few of the slides it takes you back to the material and question before the section you are currently on. Also, for fluidity I think it might be work a little easier if the "next" button was in the same place on every slide and if entire answer (letter and word) was hyperlinked instead of having to hover over the area to try to find the "sweet spot" on the link.