Thomas Malthus proposed that (Multiple Choice)

Thomas Malthus proposed that
  a. the food supply multiplied faster than the population.
  b. the population tended to outgrow its resources.
  c. the food supply and population multiplied at the same rate.
  d. artificial selection was the key to evolution.
  e. natural selection was the key to evolution.

Question 2

After his return to England, Darwin pondered which of the following questions most heavily?
  a. What could explain the great numbers and variety of species?
  b. Does the fossil evidence support uniformitarianism?
  c. Are the extinct and living armadillos the same species?
  d. Did Galpagos mockinbirds have a common mainland ancestor?
  e. Will natural selection work in England?