To estimate historical whale populations, one research group analyzed genetic variation among living whales, while another reconstructed catch totals from nineteenth-century ship logs. A later review described the studies as competing attempts to recover exact population counts from different records. The description captures their use of distinct records, but both methods convert incomplete traces into population ranges rather than exact counts. _____ the studies offer distinct estimates of plausible intervals, not rival claims about known totals.
Which choice completes the text with the most logical transition?
For difficult transition questions, determine not only the broad relationship but also its exact scope. When a passage preserves part of an earlier claim while correcting another part, distinguish a transition signaling refinement from one signaling complete contradiction or concession.
Hints
Assess the review’s description
Determine which part of the review’s characterization is supported and which part is not.
Track what the final sentence preserves
Notice that the final sentence retains the idea that the studies produce distinct estimates while revising what those estimates represent.
Distinguish refinement from contradiction
Choose a transition appropriate for making a statement more exact, rather than rejecting the entire preceding description.
Step-by-step Explanation
Identify the original description
The review characterizes the studies as competing attempts to recover exact population counts from different records.
Separate the accurate and inaccurate parts
The studies do use different records, so that part of the description is accurate. However, they produce estimated ranges rather than known, exact totals.
Determine the final sentence’s function
The final sentence gives a more exact characterization that retains the accurate distinction between the studies while correcting the description of their results. Therefore, a transition signaling refinement is needed.
Choose the transition
“More precisely” introduces the refined description: the studies estimate plausible intervals rather than claim to establish known totals.