he sympatric speciation of Hawthorn and apple maggot flies:a
has occurred in part because the adult flies emerge at different times of the season.
b. has been linked to allopolyploidy.
c. has occurred as a result of mutation and speciation within the host species.
d. has resulted in subtle but distinctive changes in the physical appearance of the two flies.
e. has occurred because of a geographic barrier
A
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