What is the best radioisotope to use to find the absolute date of a fossil that is very, very old? Carbon 14

Carbon 8

Uranium 235

Lead 520

a adaptation is when organism changes itself to fit the environment

ex. when its cold outside i wear a jacket

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the atmospheric gas that forms a mild acid when dissolved in water is called carbon dioxide. the correct answer is a. 2.) chemical weathering would cause an inscription on a marble headstone to become harder and harder to read over time.