1) Large/tough seeds act as a selection pressure on what trait?
a. Large bills
b.Large feathers
c.Dark feathers
d.Long tails
2) What causes the change in bill depth between 1976 and 1978?
a.The lack of rain
b.The persistence of only larger seeds
c.Differential survival of large-billed birds
d.Change in alleles
e.All of the above
3 )What would a decrease in Bmp4 cause?
a. An increase in beak depth (leading to bigger beaks)
b. A decrease in beak depth (leading to smaller beaks)
c. .An increase in body size (leading to larger beaks)
d. A decrease in body size (leading to smaller beaks)