It was long thought that maize was domesticated solely from parviglumis—a subspecies of teosinte, a wild grass—in Mexico’s lowlands about 9,000 years ago. However, a 2024 analysis has revealed that between 15 and 25 percent of maize’s genes can be traced to a second __________ highland subspecies of teosinte that was hybridized with maize around 4,000 years after the initial domestication.
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Verbal·Standard English Conventions·Boundaries
hardWhich choice completes the text so that it conforms to the conventions of Standard English?
A
ancestor, mexicana, a
B
ancestor: mexicana, a
C
ancestor mexicana a
D
ancestor, mexicana. A