The article argues that Darwin based his proposal for evolution by natural selection on four premises. If you released a group of genetically identical pigs into the wilds of western massachusetts to fend for themselves they might slowly adapt to their environment (over many generations), but the population would not conform to one of the premises. Which one?
Select one:
a. Organisms are variable.
b. At least some of the organisms' variability is herritable.
c. More offspring are produced than required for parental replacement.
d. Most organisms have stable populations.