Certain fossils, called index fossils, help geologists match rock layers. To be useful as an index fossil, a fossil must be widely distributed and represent a type of organism that existed for a brief time period. Index fossils are useful because they tell the relative ages of the rock layers in which they occur.
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D. chemical energy to heat energy to kinetic energy to electrical
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organismo que consiste en una sola célula
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Espero que esto ayude.
