I wrote this task to go along with science. It relates to ecosystems, survival of a species and multiplication/ area concepts. This task is written to meet the common core requirements, but is flexible in its possibilities. It is up to you how you have your students solve the problems. They do have to explain their thinking, and illustrate their solutions. It can be used as a task that you walk them through the entire process while thinking aloud how to solve each problem, or as an assessment of their knowledge. You could also have students work in cooperative groups to find the solutions.