I used this PowerPoint with my AP Environmental Science classes. The PowerPoint is 13 slides long (the preview has 4 slides out of the 13). This could also be used with biology or non-AP environmental science students. This PowerPoint discusses trophic levels, producers/consumers/decomposers, the 10% rule, biomagnification, and bioaccumulation.
You will receive the editable PowerPoint file with 13 slides, so you can customize it to your liking or use as is.