speciation

• speciation is the development of new species
• isolation is where populations of a species are separated
• isolation can happen due to a physical barrier, like a river or mountain
• conditions on either side of a geographical barrier can be slightly different, causing different characteristics to be more predominant. over time, this can lead to speciation
• if two populations of the same species are separated by a physical barrier, the populations adapt to new environments. this leads to the development of a new species.
• alfred russel wallace independently came up with the idea of natural selection