Hopefully this is relatively self explanatory. 1) Click a button 2) Watch 3) Click another button 4) Watch Continue until satisfied.
This can teach you how some things evolved. (NOTE: I am not a scientist: this is obviously just a childish representation of a possible way that these things could have evolved. I highly recommend not using this as a viable source for a research paper or any other important document of that matter. In fact, just don't... just...no.) I wrote a long note.... Sorry, other note. I made this a long time ago on Scratch 1.4, so the drawings aren't very good... as you can most likely tell... I should fix it. Oh well.