What is the “trigger” that tells the hummingbird how to build its nest?

1. What is the “trigger” that tells the hummingbird how to build its nest? 2. What “four things” did Darwin notice that Kingsolver describes as “….the greatest, simplest, most logical construct ever to dawn across our curiosity about the workings of natural life”? 3. Kingsolver claims that “…every grain of wheat holds inside its germ a slightly separate destiny.” What are the implications of that separate destiny? 4. How is diversity maintained in natural systems? 5. What does Kingsolver mean when she states that “survival carries fitness forward and death doesn’t”? 6. What did Vavilov discover about the genetic variation of crop plants? What exactly is the problem with “Magic Wheat”?