How do scientists determine what foods were eaten by extinct hominins such as Neanderthals? In the past, researchers
were limited to studying the marks found on the fossilized teeth of skeletons, but in 2017 a team led by Laura Weyrich of the
Australian Centre for Ancient DNA tried something ______ the DNA found in Neanderthals’ fossilized dental plaque.
new: sequencing
new; sequencing
new, sequencing:
new. Sequencing
Choice A is the best answer. “A team…tried something new” is an independent clause leading to an explanation of what the
new thing was. A colon can only be used at the end of an independent clause, and typically introduces further explanation
that expands upon the ﬁrst clause, which makes a colon the perfect choice here.
Choice B is incorrect. This choice results in a punctuation error. “Sequencing…dental plaque” can’t stand on its own as a
sentence, and so it can’t be linked to the independent clause “a team…tried something new” with a semicolon. Only two
independent clauses can be connected in this way. Choice C is incorrect. This choice results in a punctuation error. If
“sequencing” is included in the ﬁrst clause, it can no longer stand on its own as a complete idea. Since a colon can only
come at the end of an independent clause, using one in this way creates an error. Choice D is incorrect. This choice results in
a sentence fragment. “Sequencing…dental plaque” can’t stand on its own as a sentence.