I ask students to write down what they know about millipedes and centipedes. Then I ask them to write down any ideas they have about the life cycles of millipedes or centipedes.
The following prompts can be used to assist students who are having a difficult getting started.
If there is a student who has never heard of either of these animals, I pair them with a student who does have some background knowledge.
I ask students to watch this short video about centipede life cycles. You will note that there are some pauses after questions are asked. This is intentional, to allow for and encourage think time. After the video I have them fill in the notes section on their student study guide or in their science notebook. Then they watch it again so that they can add additional details. Students can easily do this in their their science journal, or they can use this organizer.
Next they watch this short video about millipedes and follow the same procedure: they answer the questions, take notes, and prepare themselves to fill in the comparison diagram.
This is the page from which I obtained the photos of the cave centipede instars. It shows all the stages.