I have created this Think Tac Toe for ecosystems. After introducing and teaching ecosystems my students complete this for a grade. They have a choice of completing any 3 squares along with the center graded task. With Common Core here I have been practicing writing in all my subject areas. Here the students must use the knowledge learned to write and complete the tasks. I have also included the Think Tac Toe sheet along with the directions that I placed on top of file folders. This way the students go to the folder they need and inside the folder is any work the student needs to complete each square. I also included 3 tasks that the students complete for their middle assignment. There is a low, medium, and high task. I also included the vocabulary dominoes I use as well as the QR codes and answer sheet. All the work is editable so feel free to change it to meet your needs!