Scientists in Peru have discovered the skull(颅骨) of an ancestor of modern-day whales. The fossilized skull is believed
The scientists reported the skull was in good condition when
Scientists say the ancient mammal was a basilosaurus, which is in the cetacean(鲸目) family. The name basilosaurus means “king lizard(蜥蜴)” and the animal
Salas called the animal “a marine monster” that may belong
Salas explained that when the ancient basilosaurus died out, its skull likely sank to the bottom of the ocean,
“Back during this age,
Ancient footprints discovered in New Mexico indicate that early humans arrived in North America around 23, 000 years ago, researchers reported Thursday.
The first footprints
The findings may help scientists solve a mystery that has long attracted scientists: When did people first arrive in the Americas, after
Most scientists
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Based