In your lawn, there are hundreds of dandelions, each with minor genetic variations resulting from sexual reproduction and random mutation. If you chose not to mow your lawn, those dandelions that grew the tallest would get the most sunlight and have a reproductive advantage over the smaller variety. If you cut the lawn frequently, those weeds that flowered quickly at a shorter height would flourish. If you developed a taste for dandelion greens, you may select those with the most tender leaves. The Great Dane down the street may leave his mark on your yard, so the dandelion that tolerates high urea levels may do best. Your drunken brother-in-law may crash his crop duster on your lawn, a swarm of locusts may strip it bare, or a meteor may convert your yard into a crater. Any event may affect the success of a particular type of dandelion or cause its extinction. Inferrring a supernatural motivation from a random event without a shred of evidence allows any purported cause to have validity, be it aliens, fairies, or Osiris.
Natural Selection simply means constant changes in genetic make up and constant changes in the environment determine which organism will be successful. Termites and humans are both quite successful because both species are capable of altering and exploiting their environment to their advantage, reproduce quickly, and are adaptable over a range of environments. Pandas seem to be having a tougher time of it. However, things can change quickly. Just ask a dinosaur.
