Which is the correct comparison of the sources and ideas of Charles Darwin and Alfred Russel Wallace?
A) Darwin studied biogeography and proposed the idea of natural selection. Wallace studied finches and proposed the idea of speciation.
B) Wallace studied biogeography and finches and proposed the theory of natural selection. Darwin studied biogeography and proposed the idea of speciation.
C) Darwin and Wallace both studied biogeography but only Darwin proposed ideas and theories based on his observations.
D) Darwin studied biogeography and finches and proposed the theory of natural selection. Wallace studied biogeography and proposed the idea of speciation.