I am confused about Chapter 1: Biodiversity.  The Unit Lesson Plan says that Chapter 1: Biodiversity is through 41 slides, but when I look at the slideshow for Chapter 1, there are only 22 slides.  Please help me understand this.  What am I missing?  Is this just an error in the Unit Plan?  Have the slideshows been updated or changed, but the Unit Plan was not changed, or vice versa?

A new unit plan has been posted. Thanks!