The table below shows the half-life of an element: Half-Life Data ElementHalf-Life Uranium-235700 million years Scientists have found that the Uranium-235 content of an unknown prehistoric sample was reduced to one-fourth. What best describes the identity of the sample?
A stone artifact that formed 700 million years ago
A mammoth that died 1,400 million years ago
A cliff that formed 1,400 million years ago
A plant that died 700 million years ago
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Uncle tom's cabin started out as a series of articles printed in the national era, a newspaper.
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Which events occurred during the space race? check all that apply. (a) nasa was established. (b) yuri gagarin orbited earth. (c) the soviet union launched salyut. (d) the united states launched skylab. (e) the united states launched explorer 1.
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The table below shows the half-life of an element: Half-Life Data ElementHalf-Life Uranium-235700 mi...
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