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1. of South China in the Middle Triassic Period

2. when they first saw

3. seen at the base of reptiles

4. or its unborn baby

5. one of many astonishingly well-preserved specimens

6. where the mother has a placenta to nourish the developing embryo

7. determined the sex of its babies genetically

Head of The University of Queensland’s School of Earth and Environmental Sciences and co-author Professor Jonathan Aitchison said the fossil unexpectedly provided the first evidence for live birth in an animal group previously thought to exclusively lay eggs. “Live birth is well known in mammals, A _______________,“ Professor Aitchison said. “Live birth is also very common among lizards and snakes, where the babies sometimes ‘hatch’ inside their mother and emerge without a shelled egg.”

Until recently it was thought the third major group of living land vertebrates, the crocodiles and birds only laid eggs. “Indeed, egg-laying is the primitive state, В_______________, and in their ancestors such as amphibians and fishes,” Professor Aitchison said. He said the new fossil was an unusual, long-necked marine animal called an archosauromorph that flourished in shallow seas C_______________.

The creature was a fish-eater, snaking its long neck from side to side to snatch its prey. Its fossil was D _______________from new “Luoping biota” locations in south-western China. There were no known fossils like this (marine vertebrates of this age) from Australia. Lead author Professor Jun Liu from Hefei University of Technology China, said the researchers were ‘excited’ E________________this embryonic specimen.

“We were not sure if the embryonic specimen was the mother’s last lunch F_________________,” Professor Liu said. “Upon further preparation and closer inspection, we discovered something unusual.” He said the embryo was inside the mother’s rib cage, and it faced forward; swallowed animals generally face backward because the predator swallows its prey head-first to help it to go down its throat. Furthermore, the small reptile inside the mother was an example of the same species.