Examine the two squirrel populations in the following figure.The populations are separated by a geographic barrier.If after a long period of time the two species are no longer separated,what evidence is needed to determine if speciation has occurred? 
Definitions:
Dull Percussion
A term used in clinical examinations to describe a thudding sound produced when tapping over dense tissue areas, often indicative of underlying pathology.
Diaphragmatic Excursion
The movement of the diaphragm during breathing, indicating its functionality and health.
Anterior Chest
The front part of the chest or thorax, encompassing the area from the collarbone to the lower ribs, important in assessing heart and lung health.
Chest Expansion
The measure of how much the chest increases in volume during inhalation, an important indicator of lung health and capacity.
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