What are current estimates of the number of species on earth? Before Darwin and his theory of evolution what were the beliefs on where species come from? On Darwin's adventure where did he first make landfall? After four years where did they land? What interesting species did Darwin discover there? How/why do species change over time? How did Darwin begin to prove his theory? Who else put forward the idea of natural selection? What was scandalous about Darwin's theory put forward in his book? What was Owen's belief about the origin of species? What was unique about the fossil that Owen purchased? Why did this finding support Darwin's theory? What are the odd shapes in the extremely ancient rocks? Why didn't scientists believe they could be fossils? How do we date fossils? Who discovered this process? How is it that frogs exist in both Africa and South America? How is an eye formed? Is it designed or evolved gradually? What did Mendel discover? What does modern genetics confirm? How long ago did sea creatures venture onto land? What is Darwin's most important discovery?