When Evolution Occurred on the Galápagos Islands,the Finch Beaks

Multiple Choice

When evolution occurred on the Galápagos Islands,the finch beaks

A) of individual birds in the population changed size and shape between the time of fledging the nest and adulthood due to the environmental stress induced by drought.
B) varied in size across the population and sometimes conferred benefits in feeding,survivorship,and reproduction that were passed down to surviving offspring.
C) had corresponding genetic codes in the DNA that were modified or mutated by individuals when attempting to survive the stressful environment of the drought.
D) changed in size and depth only during the lifetime of the fittest birds able to survive the drought.