This PowerPoint file is a wonderful presentation about the differences between heterotrophs and autotrophs. The images used in the presentation are in the "public domain" so there is no worry of copyright violation. At the end is a short review quiz to help check for understanding.
You can view this entire PowerPoint on my YouTube page prior to purchase. This way you can see exactly what is included in the PowerPoint. However, if you purchase this product the PowerPoint will not be narrated. You still have to teach yourself (lol). The address to view this presentation is below: