Test # 21
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500 questions in 50 tests. Each test contains 10 questions.
Idiom of the Day
wear down (something) or wear (something) down
to make something become less useful or smaller or weaker because of wear or age
Little by little, the water wore down the beach at the edge of the river.
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Strangest Prehistoric Creatures To Rule The Earth
In contrast to most of the massive prehistoric creatures on this list, Epidexipteryx was a tiny prehistoric creature. Presumably the first example of ornamental feathers (think of a peacock), Epidexipteryx grew up to 17.5 inches (44.5 cm) with almost half of that encompassing just the tail feathers. This feathered dinosaur lived during the Middle or Upper Jurassic age throughout Inner Mongolia.