The finches adapted over time to better suit their environment that they were in -- the size and shape of their beaks changed as a result of natural selection.
Geographical isolation usually refers to <span>two populations of the same species being separated due to some type of physical barrier. This separation of population </span>occurs<span> when a body of water or land forms and divides a habitat. </span>Geographic isolation<span> of a species also can </span>occur<span> when animals migrate to an isolated island.</span>
Why do we have to start with the lowest magnification to examine a new slide? It is easier to focus on the specimen.