<h2>Allopatric speciation </h2>
Explanation:
Allopatric speciation is the formation of species due to geographical barriers like continental drift, origin of mountain, origin of ocean, etc and such type of speciation is called allopatric speciation
In case of the given species of fish they were split by the formation of the isthmus of Panama a long time ago as a result fish developed changes in their genes to adapt to the change in environmental conditions hence resulted into two different species which clearly represents allopatric speciation
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Changes in blood volume affect arterial pressure by changing cardiac output. An increase in blood volume increases central venous pressure. This increases right atrial pressure, right ventricular end-diastolic pressure and volume.