In addition to the origins of life on earth, what features of the land does the modoc myth explain

The Modoc myth, in addition to the origins of life, offers the reasons to why bears walk on four legs and why they do not speak, and also why the Earth was created in the first instance by a "Sky Spirit", the reasons why he decided to live with his family on the Earth; it also explains how Indians were made and their ancestral origins. 

You should never redesign your experiment. try and see what in your experiment you made a mistake on or try and test your experimemt with somebody else. see if they get the right results.