This is a FREE PPT. I use this PPT to show my students while they're filling in the blanks on their Intro to Ecology Open Notes (sold under separate cover in my store). The words that they need to fill in the blanks are in RED in the PPT so it's super easy to follow. OR. . ., simply use this PPT by itself as an intro and then have the students complete the assignments "Intro to Ecology PPT W.S." or "Ecology Drag and Drop" (also sold under separate cover). You can also make it your own by changing or adding to it - gotta love PPT!