Oysters are an invertebrate the lives today in brackish waters along coastal zones. When a geologist working in stratified rocks observes a limestone bed with oyster fossils overlain by beds with clam and echinoderm fossils indicative of marine conditions, the safest conclusion to gather from the fossils is that ______.

Question

Quizplus · Accepted Answer

The presence of oyster fossils overlain by clam and echinoderm fossils indicates a change in environment from brackish waters to marine conditions, likely due to a rise in sea level. Option A is not supported by the evidence, option B is not a safe conclusion as there is no evidence of extinction, and option D is not correct as there is sufficient information to draw a conclusion.

Oysters Are an Invertebrate the Lives Today in Brackish Waters