Populations of a plant species have been found growing in the mountains at altitudes above 2,500 meters. Populations of a plant that appears similar, with slight
differences, have been found in the same mountains at altitudes below 2,300 meters,
Describe TWO kinds of data that could be collected to provide a direct answer to
the question, do the populations growing above 2,500 meters and the populations
growing below 2,300 meters represent a single species?