Science Test

Question Answer
The preserved remains or traces of organisms that lived in the past they usually occur in sedimentary rock Fossils
The time it takes for half of the radioactive atoms in a sample of a radioactive element to decay Half life
This time began in the Paleozoic Era the many new forms of life that evolved were invertebrates that lived in the sea
Cambrian explosion
Forms when dissolved minerals replace the remains of an organism and then Harden to form Rock Petrified fossil

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