Question

blue holes—large marine sinkholes, like deans blue hole in the bahamas—can be hundreds of meters deep and are sometimes part of widespread subterranean networks of passageways. in 2021, researchers conducted the first formal study of the taam ja blue hole (tjbh), located in a bay of fresh water and salt water on mexicos coast, and reported a maximum depth of 274 meters. laura carrillo and colleagues later reinvestigated the depth of the tjbh, determining that it exceeded 400 meters; additionally, they detected variations in characteristics across water layers. layers more than 400 meters deep began to show density and salinity conditions akin to those of the nearby caribbean sea. carrillo and colleagues therefore suggest that ____ 15 mark for review which choice most logically completes the text? a in the tjbh, there are greater differences between water layers less than 275 meters deep than there are between water layers greater than 400 meters deep. b researchers should reevaluate existing measurements of the depths of deans blue hole and other blue holes where the conditions in very deep waters are similar to those of waters in open seas. c the apparent relationship between depth and salinity level in the tjbh is the inverse of that found in the caribbean sea. d there may be tunnels and caves that connect the tjbh and the waters of the caribbean deep underground.

Explanation:

The text mentions that layers more than 400 meters deep in the TJBH have density and salinity conditions similar to the nearby Caribbean Sea. This implies a possible connection between the TJBH and the Caribbean Sea, such as underground tunnels or caves. Option A is about water - layer differences which is not the main conclusion. Option B is about re - evaluating other blue holes which is not directly supported by the TJBH study. Option C claims an inverse relationship which is not mentioned. Option D is the most logical conclusion based on the similarity of water conditions.

Answer:

D. there may be tunnels and caves that connect the TJBH and the waters of the Caribbean deep underground.