Multiple Choice
What is the main reason why the Rhagoletis flies that prefer apple and those that prefer hawthorn have not collapsed into a single species?
A) There are no geographic barriers present.
B) There are geographic barriers are present.
C) There is no intermediate plant species between an apple and a hawthorn tree.
D) Apple and hawthorn trees are closely related.
E) The flies have different numbers of chromosomes.
Correct Answer:
Verified
Correct Answer:
Verified
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