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CLEP Natural Science Practice Tests & Test Prep by Exam Edge - Topics



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Understanding what is on the CLEP Natural Science exam is crucial step in preparing for the exam. You will need to have an understanding of the testing domain (topics covered) to be sure you are studying the correct information.

  • Directs your study efforts toward the most relevant areas.
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  • Aligns your preparation with the exam's expectations.
  • Increases the likelihood of success.
  • Keeps you informed about your field's current demands and standards.
There is no doubt that this is a strategic step in achieving certification and advancing your career.

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CLEP Natural Science Exam Blueprint

CLEP Natural Science - Exam Topics Sample Questions

Hard parts of a prehistoric object are changed and preserved through which of the following?

Correct Answer:
recrystallization


the process of recrystallization is fundamental in the preservation of the hard parts of prehistoric organisms, such as bones, shells, and teeth. this natural phenomenon occurs under specific geological conditions, where the original minerals in the hard structures of these organisms are altered due to changes in environmental factors like temperature and pressure.

when an organism is buried, the hard parts are subjected to the geological processes occurring within the earth’s crust. over time, these parts can become encased in sediment and are subsequently subjected to increased pressure and temperature as they are buried deeper. these changes in the physical environment can cause the minerals in the hard parts to dissolve and re-precipitate, forming new mineral structures through recrystallization.

recrystallization differs from simple mineral replacement. in mineral replacement, the original biological material is gradually replaced by different minerals that crystallize within the biological structure, often retaining the original morphology but changing the chemical composition. in contrast, recrystallization involves the transformation of the original minerals into new forms while staying within the same chemical system. this can lead to changes in crystal size and orientation but typically within the same overall chemical framework.

the importance of recrystallization in paleontology cannot be overstated. it helps in the preservation of the fossil record, allowing scientists to study the anatomical structures of extinct organisms which are crucial for understanding evolutionary history. moreover, analysis of recrystallized parts can provide insights into the environmental conditions that prevailed during the time the organism was alive and after it was buried.

understanding the process of recrystallization and distinguishing it from other fossilization processes like permineralization or carbonization is essential for accurate paleontological interpretation. each preservation mode provides different kinds of information about the past, contributing uniquely to our understanding of earth’s history and the life forms that once existed.