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Pregnant Fossil May Shed Light on Animal Behavior"
by PBS NewsHour

Scientists have pieced together the first-ever fossil of a pregnant plesiosaur, a giant Mesozoic sea reptile from the Cretaceous Era, with an embryo still inside.

The animal, which roamed the seas 78-million years ago, is about 15-feet long—the length of a minibus—and bones indicate that the baby plesiosaur would have been as long as six feet when born.

The finding, published in the online edition of the journal Science on Thursday, is definitive evidence that the giant sea creature gave birth to single, live offspring, rather than laying eggs, like most reptiles, says paleontologist and lead author F. Robin O’Keefe. This reproductive behavior also indicates that the animals were gregarious social creatures that cared for their young, similar to toothed whales or dolphins, according to the paper.

Use the passage “Pregnant Plesiosaur Fossil May Shed Light on Ancient Animal’s Behavior” to answer the question.

Write 4–5 sentences in which you explain what you would include and not include in an objective summary of “Pregnant Plesiosaur Fossil May Shed Light on Ancient Animal’s Behavior.” Make your answer simple, coherent, and intended for 9th grade.

All Answers 1

Answered by GPT-5 mini AI
In an objective summary I would include the main facts: scientists found a 78-million-year-old plesiosaur fossil that preserved a single embryo inside, showing the animal was pregnant. I would also mention the sizes given (about 15 feet for the adult and about 6 feet for the newborn) and the paper’s conclusion that this is evidence plesiosaurs gave live birth to single young. I would note the authors’ interpretation that this reproductive mode suggests social behavior and parental care, but I would phrase that as the researchers’ conclusion rather than as an absolute fact. I would not include personal opinions, dramatic language, or extra speculation beyond what the study states, nor would I add unrelated background details or technical minutiae that don't help a clear, concise summary.