This investigation was modified from the HHMI Stickleback Modeling activity where students examine two different forms of the the stickleback fish. One form has spines and bony armor and is found in the ocean. The other has less armor and is missing its pelvic girdle, and is found in fresh water lakes. The activity has…
Students to examine two lakes and compare the types of fish in each. They learn how lakes form, and why spines may be an advantage for some populations.