This lesson plan begins with an introduction to food webs, including key vocabulary. Then split students into groups, where each group is assigned a different marine ecosystem. The groups will be given 2-sided cards, where one side has the name and image of an organism, and the other side a description of the organism’s characteristics. The group’s job is to construct a food web of the ecosystem, then explain their reasoning. To adapt this for high school students, the back sides of the cards will be blank, and the students can research information about the organisms before constructing food webs.