J. V. Siry, Ph.D.
The Imperiled Planet an on line guide
How is theirs' --Darwin's and Mendel's concepts– the greatest idea?
That all populations evolve was the concept was intuitively and experimentally seen by both:
Wallace in Indonesia and Darwin in South America:
Wallace's line between Bali and Lomboc, also separating Borneo from Sulawesi suggesting that the animals and plants on the eastern and Asian side of the line differ markedly from the Australasian and western side of the line. These two groups evolved in isolation from one another after the sea level rose at the close of the last ice age.
Galapagos Islands that Darwin described.
Young Charles Darwin, upon his return from these islands, shared his tagged finches, seen below, with the ornithologist John Gould who subsequently informed Darwin that he had collected not the same (one) species of finch, but three species of finches on these islands. As Darwin checked his field notes and recognized that the specimens came from separate islands with divergent conditions he confronted an awful truth. He began to realize that species could vary, change over time, and that he now had to explain how that could possibly occur, because scientists argued that species could not change.
The specimens of birds Darwin took away.
A tortoise from the Galapagos, Islands.
Artificial selection, sheep in a meadow
The descent of humans, or human evolution is complicated.
What Genes do is to create internal conditions so creatures can respond
Evolution and environment, reveal that ecology is partners with the genes for
Evolution explosion; at about the Cambrian Period in the earth's past adaptive radiation took a huge leap forward; ultimately leading to vertebrates that were our ancestors.
Storm over the Amazon, Diversity of Life