What property of radioactive elements makes them useful for determining absolute age

Radiogenic isotopes.

Explanation:

Dating is a process by which archaeologists get to know the absolute or relative age of a past objects. Absolute dating deals with the process of determining  the absolute age of the  element.  During dating of objects, or during the radiometric dating if we know the half-life of the element, it will be easy to know the age of that object by determining the decay rate of the isotopes.  

fabric is silk wool ext. paper isnt

explanation:

u cant make fabric out of paper cause paper comes from wood while fabric comes from animals