Darwin, his journey, evidence for evolution, cladograms--it's all in here. Use actual locks and boxes, OR use this fun lesson with a simple envelope system! Enough problems for 6 groups of students, or more if you use the problems in duplicate. I actually made different codes and problems for each group. With locks: utilizes 3, 3-digit locks, one MasterLock combination lock, four boxes, some paper, and a lot of fun!!
I got the locks and toolboxes at Dollar Tree, or I also bought inexpensive unf