You are presented with the question "What is used to determine the age of extinct organisms?" and the following answer choices: 
- viruses
 - an electron microscope
 - Echinoderm.
 - fossils of Panthera leo
 - genetic material
 - the Sun
 - tectonic plates coliding
 - radioactive dating

Now knowing that radioactive dating is used to determine the age of fossils and extinct organisms represented only by fossils, choose the best answer.


 

        radioactive dating 