Each population of squirrels evolved different adaptions for each side of the canyon and eventually became genetically different populations. this is an example of which stage of speciation?

This is an example of natural selection.
(please mark brainliest) 

Can you put the picture?

1) clean up you lab area2) dispose of the chemicals as instructed by your teacher3) put everything back where it belongs unless your teacher tells you otherwise4) dispose of gloves5) wash hands with soap and water