A student investigating a small ocean-alkalinity carbon experiment recorded these source notes: - Researchers added a measured amount of crushed alkaline mineral to a contained coastal test area. - The water absorbed additional carbon dioxide and showed a modest rise in pH. - The relative abundance of several plankton groups changed during the six-month trial. - Fish growth did not change measurably, and the test area was much smaller than a natural bay. The student wants to use the notes to establish why the experiment matters. Which choice most effectively uses relevant information from the notes to accomplish this goal?