Connect - During our evolution I tried a lesson that is not included in the book, but still makes thinking quite visible. Students need to demonstrated that they can support a claim that the theory of evolution is supported with evidence. Their task was to refute an erroneous article claiming that evolution could not have happened.
Extend - This was also a good way to connect to the Common Core Science Standards where students need to communicate their claims with supporting evidence in a written format.
Challenge - I found that many students felt that a written letter is a very informal way of writing. Many students did not complete requirements of explaining with the forms of evidence meant. Instead they just mentioned the forms of evidence. Another challenge was grading all 53 of these letters!